The present invention is directed to methods and devices for processing recorded interactions. More particularly, the present invention is directed to methods and systems for archiving recorded interactions between a server and a user and for retrieving stored recorded interactions.
For systems employing interactions between a user and server, it is often desirable to be able to view the interactions, ideally in a manner that is transparent to the user. This is particularly desirable in a context such as sales, customer service, and e-commerce, where interactions between customers and customer service agents via a web connection or a phone connection are important indicators of customer satisfaction.
Attempts have been made to recreate interactions between a user and a server. For example, click stream analysis procedures have been used to recreate interactions between a web user and a web service provider. This type of procedure is analogous to reviewing and analyzing the script to a movie. While this procedure reveals some information about the interaction between the server and the user, it does not provide a clear tangible picture of special effects, the environment, chemistry between the user and the server, etc.
Other attempts have been made to replay recorded interactions between a server and a user. However, these attempts are typically implemented at the server, consuming a lot of server resources, and are suitable only for a particular type of server. In addition, these approaches typically do not distinguish between interactions that are considered important and interactions that are not important. Thus, a lot of time and resources are wasted on storing and replaying unimportant recorded interactions.
There is thus a need for a technique for selectively recording data captured during an exchange between a server and a user. There is further a need for storing recorded interactions in an efficient manner.
It is an object of the present invention to provide a method and system for archiving data exchanged between a user and a server in an efficient and reliable manner. It is a further object of the present invention to provide a method and system for retrieving stored data exchanged between the user and the server in an efficient and reliable manner.
According to one embodiment, these and other objects are met by a method and apparatus for archiving at least one contact between at least one server in an enterprise and at least one user. A contact that includes a recorded interaction between the server and the user and is associated with a contact folder in a local storage is selected to be archived. The recorded interaction satisfies at least one predetermined business rule, and all contacts that satisfy the same business rule are associated with the same contact folder. A portion of the contact is selected to be archived, and a time to archived the selected content is determined. The selected portion of the contact is then archived in an extended storage at the determined time.
According to an exemplary embodiment, archiving is performed by extracting the contact from the associated contact folder in the local storage and forwarding the extracted contact to an extended storage.
According to another embodiment, a method and apparatus are provided for retrieving at least one contact between at least one server in an enterprise and at least one user. At least one stored contact including a recorded interaction between the server and the user and associated with a contact folder in a local storage is selected. The entire contact may be selected, or a portion of the contact may be selected to be retrieved. A determination is made whether the selected contact is archived or stored locally. The selected contact or portion of the contact is then retrieved from an appropriate storage location, depending on whether the selected contact is archived or stored locally.
Further objects, advantages and features of the present invention will become more apparent when reference is made to the following description taken in conjunction with the accompanying drawings.
According to exemplary embodiments, contacts between a server and a user are archived, and archived contacts are restored. The contacts may be archived in an extended storage. Eventually, the archived contacts may be dismissed and purged, thus making efficient use of storage capacity.
In the following description, the server is referred to as a web server, and the user is referred to as a web browser. It will be appreciated, however, that the invention may be applicable to other types of servers and users.
The web browser 120 may be implemented in a personal computer, a telephone, etc. The web server 100 may be implemented as a server supporting any operating system, e.g., Unix, Linux, NT or Windows 2000. Although described as a server handling web connections, the server 100 may also handle phone connections.
The page capture module 110 is arranged between the web server 100 and the web browser 120. For security purposes, a firewall 115 may separate the web browser 120 and the page capture module 110.
The page capture module 110 operates independently from the web server 100 and the web browser 120. Thus, the page capture module 110 does not need to be customized for each type of web server but may be used with any web server, supporting any operating system.
Although the page capture module 110 operates independently from the web server 100 and the web browser, it may be implemented in the same device as the web server 100 or the web browser 120.
The page capture module 110 captures pages and other data exchanged between the web server 100 and the browser 120. Pages and other data may be captured continually or at designated intervals or time windows. The page capture module 110 may also record these pages and other data, or recording may be performed in a separate recorder server connected to the page capture module.
Each web browser 120 is assigned a unique machine identity (ID) by the web server 100. A persistent machine ID cookie may be created by the web server 110 and stored at the web browser 120 for this purpose. All pages served to a particular web browser 120 are identified and grouped by the machine ID. Although the module 110 is described as a page capture module, according to exemplary embodiments, other types of data may also be captured. For example, events and attributes may be captured. An “attribute” may be defined as a single bit of data about an event. Attributes may be captured in a manner similar to that in which pages are captured, as described above.
For event capturing, according to an exemplary embodiment an event capture module captures user side events and delivers these to the page capture module 110. The event capture module may be implemented as an applet 130 that is downloaded to the web browser 120. For the purposes of this application, an “applet” may be defined as a Java application which is configured to run within a Java-enabled browser. Applets are a way to develop user interfaces that mimic traditional desktop user interfaces in a browser environment. Java is a platform independent application development language that is used to develop stand-alone applications as well as browser-based applications.
Although shown as a separate component, the event capture applet 130 is stored at the browser, with parameters such as the web browser machine ID, the host Internet Protocol (IP) address, and the current page name. The event capture applet 130 may be notified, for example, by JavaScript embedded in the current page, whenever an event needs to be recorded. The event capture applet 130 records events such as: page load, page unload, page scroll, page resize, and browser exit. The event capture applet 130 sends captured events to the page capturing module 110 via, for example, a Transmission Control Protocol/Internet Protocol (TCP/IP) socket connection on port 80 (or port 443 for secure exchanges).
Pages and other data captured during exchanges between the web server 100 and the web browser 120 at the page capture module 110 are sent from the page capturing module 110 to a page preprocessor 125 via, e.g., a TCP/IP socket.
According to an exemplary embodiment, each captured page is assigned a unique page ID and is associated with a specific browser user machine ID. Each page may also contain the date and time that the page was captured and the page status (recording, processing, playback, etc.) After'pages are captured, this information is extracted from the captured page, and a new record is inserted into a database 145.
The page preprocessor 125 acts as a recorder server and stores the captured data in a device such as a database 145. The pages 135 are then passed on to the page post-processor 140. Alternatively, the page capturing module 110 may perform this recording. To reduce the amount of storage necessary, only predetermined portions of data may be stored, e.g., the request portion or the response portion. Also, only data satisfying predetermined rules, e.g., rules indicating timing, may be stored. When the captured pages are recorded, identifying information may also be recorded, e.g., a session record ID, a date/time of recording, a machine ID, etc. Also, for interactions such as phone calls between a customer service agent and a customer, portions of the phone call may be captured.
An exemplary page capturing module and page preprocessor are described in more detail in the afore-mentioned application Ser. No. 10/061,469.
A post-processing module 140 determines which captured data satisfies predefined rules, e.g., business rules, and records this data in a file 180, such as a Java Archive (JAR) file. The database 145 is updated to indicate what captured data has been selected and recorded for playback. This is described in more detail below with reference to
A playback tool 190 selects recorded data from the database 180, using the information in the database 145. An exemplary playback tool is described in more detail in the afore-mentioned application Ser. No. 10/061,491.
Although not shown in the interest of simplifying the illustrations, it will be appreciated that the system in
According to exemplary embodiments, business rules are applied to the recorded data in the business rule engine 150 to determine whether a page should be saved for playback. A business rule may be defined as a statement that defines or constrains some aspect of a business. A business rule may apply to data attributes of the contact, irrespective of the source, and/or a portion of the spoken conversation as evaluated by speech recognition technology. The business rule asserts business structure or controls or influences the behavior of the business.
Data from a page table database 160 and a page rule table database 170 may be used in the evaluation by the business rule engine 150. Pages that satisfy the business rules are recorded for future playback. The page table and page rule database are updated after post-processing.
When a set of captured pages is identified as a session, then a session record is created of the identified session during post-processing. The session identification information may be stored in a session table, such as that shown in
An example of a comparison of business rule with captured data may be determining whether the captured data is an interaction resulting in a sale greater than a predetermined number of dollars, determining whether an interaction was longer than a predetermined number of minutes, etc. As another example, a business rule may state that the current page is to be recorded and all previous pages for that machine ID in that session. Also, a business rule comparison may be in the form of voice recognition. For example, a business rule employing speech recognition technology may state that an interaction is to be stored if the caller says “cancel my account”.
According to exemplary embodiments, pages that do not satisfy the business rules are deleted.
According to an exemplary embodiment, the post-processing program appends the recorded JAR file to the playback JAR file in the playback directory for the current machine ID. If a playback file does not exist for the specified machine ID, the post-processing program may create one.
Images are retrieved for saved pages.
According to exemplary embodiments, events may be recorded as a text file using XML. The file has the same name as the page that generated the event.
A time period may be set for retaining recorded data, e.g., 30 minutes. This time period may be used in determining whether a page is part of a session, and pages that are part of the same session may be grouped for future playback.
Selection and storage of data for future playback are described in more detail in the above-referenced U.S. patent application Ser. No. 10/061,489, filed Jan. 31, 2002.
While the examples above discuss how captured pages are selectively recorded, the invention is not limited to selectively recording captured pages. According to exemplary embodiments, any type of data captured during an interaction between a user and a server may be selectively recorded. For example, events and attributes may be selectively recorded. Also, portions of a phone call between, e.g., a customer service agent and a customer, may be captured.
According to an exemplary embodiment, business rules are applied to captured pages using an applications server such as the server 500 shown in
Attributes of contacts and metadata may be stored in the database 530, as well as business rule data populated and manipulated by a business rules editor. The server 500 communicates with the database 530 to obtain the business rules. The engine 150 in the server 500 applies the business rules to the captured data and communicates with a recorder server 540 for recording the captured data that satisfies predetermined business rules. The servers 500 and 540 may be implemented separately as shown in
The BOL 510 interfaces with both the business rule editor applet and the DAL 520 and 525 to manage traffic to and from the database 530.
The recorder server 540 communicates with an end user via, e.g., a phone switch 560 and a PSTN 570. The phone switch may include, e.g., a private branch exchange (PBX) and an automatic call device (ACD).
According to an exemplary embodiment, exchanged data may be recorded from one or more points between the user 580 and the phone switch 560, a point between the phone switch and the server 500, or from a point between the client (agent) 550 and the server 500. This is described in more detail in the afore-mentioned U.S. patent application entitled “Method and System for Selectively Dedicating Resources for Recording Data Exchanged Between Entities Attached to a Network”, filed on Apr. 30, 2002, and incorporated herein by reference.
According to an exemplary embodiment, business rules may be added, deleted, copied, pasted, and or modified by a user, such as a supervisor, using a business rules editor implemented, e.g., on a client computer 550 as shown in
The applet may communicate to COM objects on the server 500 using a COM-Java bridging tool. This provides the capability for the applet to access the COM objects as though they were Java objects. The editor applet may be integrated with a category manager and user security administrator applets into what appears to the user to be one application. The major tasks involved in the applet, with regard to manipulating the rules and the tree control, are detailed below. For the user-initiated tasks, it is assumed that the user has the rights to perform the task.
According to an exemplary embodiment, the business rules repository may be accessed by multiple users simultaneously. Multi-user access is handled smoothly and without conflict or collision.
Much of the information used by the business rules editor to create the rule definition may be acquired from other sources including but not limited to Computer Telephony Integration (CTI) data, external data, third party software applications, a speech recognition system, etc. Event attributes, user names and categories may exist somewhere in the system for easy acquisition by the editor. For example, a category manager generates category information for use by the business rules editor to designate where a contact should be catalogued, and an attribute type manager, which is used for defining the attributes of the events generated during a contact. It is these attributes whose value comparisons make up the condition part of the business rule. The system components also include a user security administrator which defines the users of the system. This user information may be used by the business rules editor for building the condition, setting notifications and checking editing rights.
The business rules editor application may be modeled on the “explorer” format, displayed via a user interface as a split window containing a tree control on the left, and on the right, an area containing an interface for defining the properties of the item selected in the tree. Management of business rules is described in more detail in the afore-mentioned U.S. patent application entitled “Methods and Systems for Categorizing and Cataloguing Recorded Interactions”, filed Apr. 30, 2002.
According to an exemplary embodiment, there may be two application-defined folders: business rules and archived rules. These folders cannot be deleted or renamed by the user. The business rules folder is a stationary part of the folder tree and acts simply as a default. An archived rules folder may also appear, marked for example with a star, in each rule folder. The archived rules folder contains the older versions of rules which have been modified.
As indicated above, interactions may be recorded based on whether or not they satisfy predetermined business rules. Alternatively, interactions may be captured randomly using, e.g., a randomizer included in the business rules engine. This is described in more detail in the afore-mentioned application entitled “Methods and Systems for Categorizing and Cataloguing Recorded Interactions”, filed Apr. 30, 2002.
According to exemplary embodiment, contacts are categorized and stored based upon business rules.
Categorization is a method for users to group contacts in a way that is meaningful. Each category contains information, called properties, that describes itself, as well as a means for accessing the contacts that are “grouped” in the category. Categorization is described in more detail in the aforementioned U.S. patent application entitled “Methods and Systems for Categorizing and Cataloguing Recorded Interactions”, filed Apr. 30, 2002.
According to an exemplary embodiment, contact folders are storage units for contacts. Considering a contact as a single customer interaction that may be comprised of one or more events and some content representing contacts in a machine readable form, a contact folder is a way of organizing and grouping contacts in the user's view and controlling security access to the contacts. The contact folder may be defined conceptually as a repository for a contact. Contact folder creation and management are described in more detail in the U.S. patent application entitled “Methods and Systems for Categorizing and Cataloguing Recorded Interactions”, filed Apr. 30, 2002.
According to an exemplary embodiment, contacts may be listed by contact folder on a user interface.
On the right of the screen are the contacts. For each contact, the following information is listed: contact date and time, contact name, received by, contact media type icon with agent name, supervisor name at time of recording, and contact duration (HH:MM:SS). Recording type (AIM, business rule, live monitor) may also be listed. The contact date time may be expressed as MM/DD/YYYY HH:MM:SS AM. The date may be formatted according to client's regional locale Euro and US). The contact name may be formatted according to YYYYMMDD9999999 (date of the contact followed by a sequential number).
According to an exemplary embodiment, the contact media type may begin with an icon indicating the primary media type of the call (interactive voice recognition (IVR), web, inbound call, outbound call, inbound email, outbound email). This may be followed by the name of the first agent on the contact, if there was an agent.
The agent's supervisor at the time of the recording may be displayed. If there was no agent, this may be blank. If the agent had no supervisor, this may read “unassigned” or may be left blank.
The contact duration may be displayed for voice contacts or any other kind of contact.
The recording type may also be shown, indicating one or more reasons why this contact was stored, e.g., business rule trigger, AIM, or a Live Monitor, or some combination.
There may be a review status icon that is present if the contact has been reviewed. Also, there may be a review history displayed on the screen, indicating who revised the contact and when. Contacts may be reviewed by more than one person, any number of times.
The user may type text into the contact description area for the contact which is selected in the area above.
The user may select a contact for replay from the contact list. Upon selection, the events and attributes of the contact may be displayed.
When a contact is replayed, the contact list view is updated to indicate that the contact has been reviewed. For example, an icon is generated. Also, information is added indicating who reviewed the contact. The date and time that the contact was selected for replay and the date and time that the replay ended may be also be provided. This data may be used for reporting purposes.
Contact folder management is described in more detail in the afore-mentioned application entitles “Methods and Systems for Categorizing and Cataloguing Recorded Interactions”, filed Apr. 30, 2002.
Referring to
Assuming that the folder is new, using the add properties tab as shown, e.g., in
For updating a contact folder, the user selects the contact folder to be updated using a screen such as that shown in
The contact folders may be deleted, copied, cut, pasted, renamed in a similar manner.
Over time, as contacts and folders are deleted (from the user's perspective), the contacts may be associated with the recycle folder. There may also be an aging process for contacts in a folder so that they automatically move to the recycle folder after some specified number of days, which is system configurable, and can be overridden at the folder level.
When a contact folder is moved to the recycle folder, all contact associations remain in the folder. Any active business rule that is associated with the contact folder and that has no other contact folder associations, may be made inactive. Contacts associated with the recycle folder will have no associations with other contact folders at the same time.
When a user is inactivated, the inactive user's name may be removed from the folder permission for each folder.
In addition to the recycle folder, according to an exemplary embodiment, an archive storage is provided for storing contacts. According to this embodiment, the content and/or associated metadata in a contact may be moved from a local drive on the server 500 to an extended storage system, e.g., a tape archive system, a network line file store, etc. Then, the archived data may be restored onto the local driver for playback.
According to an exemplary embodiment, archiving may be performed under the control of a user, a server, a database, and a recorder server such as those shown in
According to an exemplary embodiment, a user having “modify” or “full control” rights, such as a system administrator or supervisor, may configure when archiving should occur and what part of a contact to archive. For example, the user may determine the number of days after the association between a contact and a contact folder that archiving should occur. Also, the user may determine what content in the contact to archive, e.g., whether to archive audio data, video data, or audio and video data. Metadata included in the contact may also be archived. For simplicity of explanation, the text below refers mostly to archiving of selected content.
“In addition to or instead of the user, the server 500 may be responsible for determining when to archive contacts. For example, the server 500 may perform regular archiving of content. The server searches the database for contacts ready to be archived. The contact is ready to be archived when a contact folder's association to a particular contact has expired. This means, for example, that the difference between the association's last modified data and the current date exceeds the configured number of days to wait until archiving. If a particular contact has multiple folders associations, the first association to expire may trigger the archive. The step of archiving may be performed at the earliest of the expiration times and dates.”
Once a list of contacts needing to be archive is obtained, the server 500 instructs the recorder server 540 to begin archiving. The recorder server 540, in turn, interfaces with the extended storage 590 to copy content from the local drive, which may be a hard disk drive in the server 540 or any other shared hard disk drive, onto the extended storage's medium. The process of archiving may be performed in the background, in a manner that is transparent to the user.
When archiving is complete, the database is updated by the server 500 to reflect the archived status. According to one embodiment, a contact's content properties may be modified, and the association may be hidden.
If all associations for a contact have expired, the content and/or metadata associated with the contact may be dismissed by the server instructing the recorder server to dismiss the contact.
According to an exemplary embodiment, content that is not archived may be purged during the archive process. For example, when the archive process begins for a contact with both audio and video content, but the configuration is to only archive audio content, the video content is purged when the archive process is completed.
A contact may have an association with multiple folders, and each association may have different archive, dismiss and purge dates. Therefore, according to an exemplary embodiment, archiving, dismissing, and purging may be performed according to a timeline including a union of all association's archive and purge dates. An exemplary timeline is shown in
According to one embodiment, the time to archive is determined by the first archive date in the union of contact folder associations. For archiving, the first date is used as a reliability measure such that once an archive date and time have passed in any folder, at least the selected content is archived. If the archive was postponed until the last date in the union, one folder could prevent the archive from occurring for a considerably long time after some of the other folders required to be archived.
The time to dismiss the content may be determined by the last archive date in the union. This keeps the content “online” or stored in the local storage until all associations have expired. This allows playback within any folder whose association has not expired.
The time to purge may be determined by the last purge date in the union. This keeps the archived content available until the last purge date for all of contact folder associations.
Referring to the exemplary timeline shown in
For restoring archived content and/or metadata, a user may perform a contact search, specifying the search criteria and the archive content to be included. The user's criteria is gathered and submitted to the database.
According to an exemplary embodiment, the first request to the database requests only the number of contacts to be returned. If the number of contacts is large, e.g., over 100 contacts, a dialog box may be presented to the user with the option of aborting the search or returning all the contacts. If the user requests all contacts, a second request may be made that returns the set of contacts. If the number of contacts is small, e.g., less than 100 contacts, a second request may be immediately made that returns the set of contacts.
Once a list of contacts has been returned from a search, if one or more of the contacts are selected, the user may “copy” the selected requests into a specific folder. This “copy” really amounts to the creation of a folder association for each contact selected. If an association for the selected contact already exists in the folder, its “last modified” time may be updated to the when the “copy” occurred. If the association is hidden, it may be made visible.
According to an exemplary embodiment, if, during a “copy”, one or more of the contacts has content that is not online but is archived, the user may choose to return no content, only part of the content (audio or video), or all of the content. If the user chooses to restore no content, then no additional work is done, and the contacts appears in the folder's contact list with the indication that there is archived content. If the user chooses to restore the content, a request is made to the server 500 to restore a given set of contacts. The server may perform some check to assure that the content is available.
For example, if a user selects some contact with archived audio content but not video content, and the user then requests that only video content be restored, the user is informed that the selection has filtered out all contacts, and a restore request is no submitted. If at least one of the contacts has archived video content, however, a request for the contact that actually has archived video is submitted. The other contacts without archived video may still be “copied” in to the destination folder.
According to another embodiment, when the user chooses to restore content, the content that was archived is automatically restored, regardless of the type of content. According to this embodiment, the user does not choose which archived content to restore.
The restore request may be queued and subsequently executed by processing thread in the server. The server 500 takes the request, queries the database for any necessary information, and passes the request to the recorder server 540 in a function call that runs immediately. According to an exemplary embodiment, the recorder server 540 asynchronously performs the restore, notifying the server 500 with two categories of messages: time-level and batch-level. A time-level message provides updates for each time in the batch (successful restore, failed restore, e.g.). Batch-level messages provide updates to the database as a whole (complete, suspended, etc.).
For a successful restore notification, the server 500 updates the database 530 to reflect the new availability of content. For a failure restore notification, the server updates the database to reflect the inability to restore the content. For a suspended restore notification, e.g. when the recorder server 540 doesn't have immediate access to the data, which may happen if the tape holding the data is not currently loaded on the tape drive, the server 540 updates the database 530 to reflect the suspension in restoring the content. Since the situation causing the problem can be easily fixed, e.g. loading the tape, a suspension is not considered a failure.
According to an exemplary embodiment, once a request has been suspended, the only way to resume the request is through manually requesting the server attempt the restore again (presumably after correcting the situation that caused the suspension in the first place).
When a particular item in a batch is suspended, the recorder server 540 may continue processing the rest of the batch. The recorder server then continues processing other batches in its queue.
On a batch-level notification, the server emails the user (and possibly an IT administrator) a summary of the restore process. This summary includes how many items were restored successfully, how many failed, how many were suspended, and an itemized status report for each item in the batch. An email may be sent to an IT administrator if any of the items were suspended.
When the recorder server 540 receives a request to perform a restore, it interacts directly with the extended storage system 590. The request to the recorder server may contain a batch of one or more content items to restore. This batch is passed directly to the extended storage 590, with slight modifications to the batch's data to match the needs of the extended storage system.
According to an exemplary embodiment, the extended storage 590 may include and/or support functionality that may be used to increase the efficiency of the restore (such as a tape system organizing the items in the batch based on location on the tape). In the end, the content is copied from the extended storage system onto a local storage, such as a hard disk drive in the recorder server 540.
According to one embodiment, a user may cancel a restore request in, e.g., the client or in a separate restore manager utility. The server may completely cancel any request for which processing has not started. For a process currently being processed, an individual restore may be cancelled.
According to this embodiment, when the server receives a cancel restore command, it does one of two things depending on if the given restore is currently being processed. If the restore is not currently being processed, the restore is removed from the queue and an email is sent to the requesting user with a summary of the restore process, and this summary will state all the items in the restore were cancelled. If the restore is currently being processed, the server sends a cancel current restore command to the recorder server, which stops processing the current restore after completing the current item. Asynchronous notifications are still given for each item in the restore, with “cancelled” notifications going out for all post-cancel-request items in the restore. A final “batch complete” notification is sent out, at which point the server may email the requesting user with the summary of the restore process.
If a playback is attempted of a contact with archived content, the archived content appears to not exist. In this scenario, queries to the database may not return information other than that content exists (implying it is online) or content doesn't exist (implying it is archived or truly doesn't exist). Requests to the server to playback content that is not on its local storage will fail. The archived contact may be restored, however, and then the restored content may be played back from the local storage.
Referring to
According to an exemplary embodiment, right clicking on a contact folder brings up a menu such as that shown in
By selecting one or more contacts shown in
According to one embodiment, options for restoring may be configured using a screen such as that shown in
Next, using the screen shown in
Referring again to the screen shown in
According to exemplary embodiments, methods and systems are provided for archiving recorded interactions and for retrieving stored interactions in an efficient manner.
It should be understood that the foregoing description and accompanying drawings are provided as examples only. A variety of modifications are envisioned that do not depart from the scope and spirit of the invention. The above description is intended by way of example only and is not intended to limit the present invention in any way.
This application is a continuation-in-part of a commonly assigned U.S. patent application Ser. No. 10/136,735, filed Apr. 30, 2002 as a Continuation-in-Part of U.S. patent applications No. 10/061,469, 10/061,489, and 10/061,491, filed Jan. 31, 2002, and U.S. patent application Ser. No. 10/058,911, filed Jan. 28, 2002 now abandoned. These applications are hereby incorporated by reference.
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Number | Date | Country | |
---|---|---|---|
Parent | 10136735 | Apr 2002 | US |
Child | 10285321 | US | |
Parent | 10061469 | Jan 2002 | US |
Child | 10136735 | US | |
Parent | 10061489 | Jan 2002 | US |
Child | 10061469 | US | |
Parent | 10061491 | Jan 2002 | US |
Child | 10061489 | US | |
Parent | 10058911 | Jan 2002 | US |
Child | 10061491 | US |