Number | Name | Date | Kind |
---|---|---|---|
3355546 | King | Nov 1967 | |
3492418 | Tanner | Jan 1970 | |
3816662 | Shaver et al. | Jun 1974 | |
4175216 | Kita et al. | Nov 1979 | |
4196317 | Bartelink | Apr 1980 | |
4338492 | Snopko | Jul 1982 | |
4349701 | Snopko | Sep 1982 | |
4356509 | Skerlos et al. | Oct 1982 |
Entry |
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Elektor; vol. 3, No. 9, Sep. 1977, pp. 9-18 to 9-25; "FM-Mains Intercom". |