Scarce DUOTONE Ear Hearing Aid 1920s Siemans Halske American Phonophor (item #1402345, detailed views)

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Scarce DUOTONE Ear Hearing Aid 1920s Siemans Halske American Phonophor

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Scarce DUOTONE Ear Hearing Aid 1920s Siemans Halske American Phonophor

EAR MICROPHONE

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