Number | Date | Country | Kind |
---|---|---|---|
2-64791 | Mar 1990 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
4049916 | Danner | Sep 1977 | |
4640990 | Kawade et al. | Feb 1987 | |
4737979 | Hashimoto | Apr 1988 | |
4975940 | Hashimoto | Dec 1990 |
Number | Date | Country |
---|---|---|
2160390A | Jun 1985 | GBX |
Entry |
---|
J. Gilder, More Telephone Accessories You Can Build, Hayden Book Company, Inc. (1980). |