Number | Date | Country | Kind |
---|---|---|---|
83 11613 | Jul 1983 | FRX |
Number | Name | Date | Kind |
---|---|---|---|
2029014 | Bode | Jan 1936 | |
2093665 | Tellegen | Sep 1937 | |
2165086 | Alford | Jul 1939 | |
2718622 | Harkless | Sep 1955 | |
3302133 | Buschbeck et al. | Jan 1967 | |
3879689 | Seidel | Apr 1975 |
Number | Date | Country |
---|---|---|
755219 | Aug 1956 | GBX |
Entry |
---|
Wireless World, vol. 85, No. 1524, Aug. 1979, London, "Passive Notch Filters-1", pp. 63-66 and 86. Figures 1, 5; p. 63. |