|
US3030502A
|
|
Automatic radio spectrum monitor
|
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US2602884A
|
|
Field strength recorder
|
|
US2524211A
|
|
Radio-frequency generator
|
|
US2471705A
|
|
Variable reactor
|
|
US2468688A
|
|
Impedance matcher for radiofrequency bridges
|
|
US2557697A
|
|
Square wave modulating arrangement
|
|
US2562682A
|
|
Remote-control system
|
|
US2468687A
|
|
Pulse storage device
|
|
US2708749A
|
|
Panoramic transponder
|
|
US2671970A
|
|
Flight trainer
|
|
US2719366A
|
|
Bomb simulator
|
|
US2749205A
|
|
Trace recording with identification marking on the trace
|
|
US2601226A
|
|
Noise generator
|
|
US2715207A
|
|
Wave-train detector
|
|
US2714635A
|
|
Modulator-thermal demodulator system
|
|
US2693590A
|
|
Dual amplification system
|
|
US2721974A
|
|
Magnetometer
|
|
US2626308A
|
|
Method of magnetic investigation
|
|
US2629855A
|
|
Voltage regulator system for high and low voltage regulation
|
|
US2713661A
|
|
Phase-shift magnetometer
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