| Number | Name | Date | Kind |
|---|---|---|---|
| D293443 | Davis et al. | Dec 1987 | |
| D313982 | Eilert et al. | Jan 1991 | |
| D314568 | Martin | Feb 1991 | |
| D314953 | Welch | Feb 1991 |
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|---|
| Universal Data Systems, Inc. Advertising brochure. v. 3225 Modem. |
| Integrated Network Corp. Jan. 1990 advertisement for CSU/DSU model 1056E shown in Data Communications. |