2562281 | Directive pickup for transmission lines | 1951-07-31 | ||
2423390 | Reflectometer for transmission lines and wave guides | 1947-07-01 | ||
2420892 | Frequency modulation detector | 1947-05-20 | ||
2413939 | Ultra high frequency discriminator | 1947-01-07 | ||
2153728 | Ultra high frequency signaling | 1939-04-11 |