Number | Name | Date | Kind |
---|---|---|---|
D356571 | Garmon et al. | Mar 1995 | |
1675842 | Aiken | Jul 1928 | |
3930560 | Carlson et al. | Jan 1976 | |
3947646 | Saito | Mar 1976 | |
4430520 | Tibbetts et al. | Feb 1984 | |
4434329 | Nasu | Feb 1984 | |
4453045 | Bruna | Jun 1984 | |
4528426 | Fatovic et al. | Jul 1985 | |
4789044 | Akino | Dec 1988 | |
4817164 | Bertignoll et al. | Mar 1989 | |
4867265 | Wright | Sep 1989 | |
5226076 | Baumhauer, Jr. et al. | Jul 1993 |
Number | Date | Country |
---|---|---|
2261997 | Oct 1990 | JPX |
Entry |
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AT&T brochure entitled "Monolith Microphone--3-D Pickup Pattern," two pages. |