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US2612565A
|
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Safety device for preventing accidental erasing or double recording on magnetic record tape
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US2514577A
|
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Magnetic recorder pole piece and assembly
|
|
US2468198A
|
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Magazine type magnetic recorder with multiple lane tape and traversing transducer
|
|
US2342667A
|
|
Earphone recording system
|
|
US2335277A
|
|
Magnetic recording machine
|
|
US2275961A
|
|
Multiple lane magnetic sound recording system
|
|
US2165546A
|
|
Recording system for telephone conversations
|
|
US2229326A
|
|
Sound head for magnetic recording machine
|
|
US2213246A
|
|
Magnetic sound recording and monitor system
|
|
US1257348A
|
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Interchangeable mechanical-sign unit.
|
|
US1014148A
|
|
Garment-fastener.
|
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CA524400A
|
|
Tape type sound recording and reproducing machine
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|
US1252801A
|
|
Ice-machine.
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