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US2859636A
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Push button mechanism for tape recorder and play back device
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US2793039A
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Tape recorder and playback device
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US2674459A
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Code disk for radio sonde
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US2778646A
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Tone arm assembly
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US2782042A
|
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Tone arm with a cutting and play-back needle
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US2664469A
|
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Preamplifier
|
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US2706637A
|
|
Tape-disc recorder
|
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US2635149A
|
|
Erasing means for magnetic recorders
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|
US2664501A
|
|
Frequency conversion system
|
|
US2658958A
|
|
Negative feedback frequency response compensation amplifier system
|
|
US2614846A
|
|
Automatic voice recorder
|
|
US2515309A
|
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Phonograph shaving collector
|
|
US2571831A
|
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Envelope dispenser
|
|
US2601501A
|
|
Automatic disk recorder and playback device
|
|
US2443088A
|
|
Modulating system
|
|
US2603977A
|
|
Turntable speed compensator
|
|
US2541393A
|
|
Crystal cutter driving circuit
|
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US2520757A
|
|
Phonograph-shock and vibration absorbing support
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US2478234A
|
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Phonograph-record arm mounting
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US2584257A
|
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Automatic phonograph
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