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GB613550A
|
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Improvements in sound recording and reproducing apparatus
|
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US2355751A
|
|
Sound recording and reproducing
|
|
US2345148A
|
|
Sound recording and reproducing machine
|
|
US2329482A
|
|
Sound-translating machine
|
|
US2359489A
|
|
Sound recording and reproducing
|
|
US2322467A
|
|
Sound recording and reproducing device
|
|
US2359061A
|
|
Means for recording signals
|
|
US2296872A
|
|
Sound recording and reproducing apparatus
|
|
US2366458A
|
|
Device for reproducing recorded communications
|
|
US2332598A
|
|
Disk record container and package
|
|
US2302503A
|
|
Record spindle driving device
|
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US2300239A
|
|
Signal recording and communication system
|
|
US2329492A
|
|
Signal recording and reproducing
|
|
US2296871A
|
|
Index means for sound translating
|
|
US2318628A
|
|
Sound translating machine
|
|
US2261284A
|
|
Sound record and correction marker therefor
|
|
US2293078A
|
|
Microphone
|
|
US2318627A
|
|
Sound recording and reproducing
|
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GB534886A
|
|
Improvements in sound record discs
|
|
GB532095A
|
|
Improvements in sound recording and reproducing
|
