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US2731586A
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Hearing aid
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US2754365A
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Acoustical tone control for wearable hearing aids
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US2731614A
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Coaxial-type multiple conductor contact plug
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US2662940A
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Automatic power output limiting control system for audiometers
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US2625613A
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Tone interrupter for audiometers
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US2696527A
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Hearing aid construction
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US2549629A
|
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Receiver for hearing aids
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US2650267A
|
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Hearing aid construction
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US2535834A
|
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Clip for hearing aid cases
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US2477698A
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Microphone mounting for hearing aids
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GB625912A
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Improvements in or relating to bone conduction receivers
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US2454494A
|
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Bone conduction receiver
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US2445556A
|
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Dry cell battery with terminal cap
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US2417153A
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Resilient mounting for microphones
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US2361343A
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Crystal container
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US2373180A
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Automatic volume control circuit
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US2342334A
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Variable baffle for translating devices
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US2390243A
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Hearing aid device
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