Number | Name | Date | Kind |
---|---|---|---|
D258061 | Foreman | Jan 1981 | |
D280504 | Walker, Jr. | Sep 1985 | |
D295411 | Cho et al. | Apr 1988 | |
D338890 | Nogas et al. | Aug 1993 | |
2420638 | Hellmann | May 1947 | |
4153822 | Ueda et al. | May 1979 | |
5332322 | Gambaro | Jul 1994 | |
5513259 | Pettit | Apr 1996 |
Entry |
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Telephony May 11, 1987, p. 97, Harris Telephone Test Set in upper left corner. |