Number | Name | Date | Kind |
---|---|---|---|
RE19758 | Underwood | Nov 1935 | |
1747475 | Kempf | Feb 1930 | |
2698983 | Griffin | Jan 1955 | |
2934458 | Budd et al. | Apr 1960 | |
2943598 | Newton | Jul 1960 | |
3203826 | Stobierske | Aug 1965 | |
3346413 | Lindemann | Oct 1967 | |
3533761 | Pierson | Oct 1970 | |
3741153 | Sears et al. | Jun 1973 | |
3763554 | Early | Oct 1973 | |
3877975 | Raymond | Apr 1975 | |
4191127 | Herman | Mar 1980 |
Number | Date | Country |
---|---|---|
1401931 | Aug 1975 | GBX |
Entry |
---|
Western Electric Microphone, Sep., 1978, p. 10. |
Western Electric Microphone, Sep., 1979, p. 3. |