Number | Name | Date | Kind |
---|---|---|---|
D198850 | Nicholas et al. | Aug 1964 | |
D199398 | Freeman | Oct 1964 | |
D302158 | Kubota | Jul 1989 | |
D310368 | Dergaag et al. | Sep 1990 |
Entry |
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Grossman Music Corp., p. 466, Kent microphone model No. M-23, Crystal Microphone, Mar. 1968. |