Early Acousticon carbon granule aid, 1902

Made:
1902
Early Acousticon carbon granule aid, with double microphone

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Early Acousticon carbon granule aid, with double microphone
Science Museum Group
© The Board of Trustees of the Science Museum

Early Acousticon carbon granule aid, with double microphone, 1902.

Details

Category:
Sound Reproduction
Object Number:
1951-670
credit:
Hearing Aid Manufacturers Association