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DK310586D0
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HAENGEBOEJLE, A COLD HOOK, FOR BAG-EARN HEARING DEVICE
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US4712245A
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In-the-ear hearing aid with the outer wall formed by rupturing a two-component chamber
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DE3036417A1
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Input circuit for hearing-aid amplifier - has changeover switch short-circuiting either microphone or induction coil
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DE2920208A1
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Modulated light signals receiver - has parallel control circuits for input photodiode and load resistance for interference protection
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DK454578A
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Procedure and equipment for the manufacturing of an ear piece to an earned hearing device
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DE2839230A1
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Cardioid microphone with front and rear apertures - has acoustic resistance used to obtain desired polar cardioid characteristic
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GB1592168A
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Hearing aids
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