Carbon granule aid, double microphone, 1912.

Made:: 1912

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Carbon granule aid, double microphone, 1912.
Science Museum Group
© The Board of Trustees of the Science Museum

Carbon granule aid, double microphone, 1912.

Details

Category:: Sound Reproduction

Object Number:: 1951-671

credit:: Hearing Aid Manufacturers Association

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Carbon granule aid, double microphone, 1912.

Details

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