Number | Name | Date | Kind |
---|---|---|---|
1735905 | Martin et al. | Nov 1929 | |
1816618 | Sklar | Jul 1931 | |
2301744 | Olson | Nov 1942 | |
2396222 | Foldy | Mar 1946 | |
3403223 | Kleis et al. | Sep 1968 | |
3715500 | Sessler et al. | Feb 1973 | |
3903989 | Bauer | Sep 1975 | |
4009355 | Paradowski | Feb 1977 | |
4122910 | Wehner | Oct 1978 | |
4127749 | Atoji et al. | Nov 1978 | |
4308425 | Momose et al. | Dec 1981 | |
4399327 | Yamamoto et al. | Aug 1983 |
Number | Date | Country |
---|---|---|
211395 | Oct 1960 | ATX |
212395 | Dec 1960 | ATX |
1139770 | Jan 1969 | GBX |
Entry |
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"Toroidal Microphones", by G. M. Sessler, J. E. West and M. R. Schroeder, Journal of the Acoustical Society of Am., vol. 46, No. 1 (Part 1), 1969, pp. 28-36. |