Number | Date | Country | Kind |
---|---|---|---|
4702/81 | Jul 1981 | CHX |
Number | Name | Date | Kind |
---|---|---|---|
3296553 | Reid | Jan 1967 | |
4241317 | Breitling | Dec 1980 |
Number | Date | Country |
---|---|---|
1589826 | May 1970 | DEX |
Entry |
---|
Elektronik, Band 19, Nr. 3, Mar. 1970. |
Electronic Technology, Band 39, Nr. 9, Sep. 1962. |