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US3659806A
|
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Reversible incremental recording apparatus
|
|
US3645354A
|
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Earphone pad
|
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US3634599A
|
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Electrical junction box
|
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US3633705A
|
|
Noise-cancelling microphone
|
|
US3595499A
|
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Apparatus for moving tape incrementally past a recording head
|
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US3610830A
|
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Plug-actuated transducer means
|
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US3621156A
|
|
Microphone boom
|
|
US3604861A
|
|
Spectacle hearing aid with crossover signal routing
|
|
US3431543A
|
|
Quick connect electrical connector
|
|
US3488457A
|
|
Earphone housing with offset opening for sound quality variation
|
|
US3431370A
|
|
Hearing aid coupling
|
|
US3447160A
|
|
Adjustable headset
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