Category:Hearing aids of the 1900s
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Media in category "Hearing aids of the 1900s"
The following 4 files are in this category, out of 4 total.
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Acousticon - 1906 hearing aid.jpg 1,106 × 1,280; 553 KB
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Museum of Medicine Berlin Germany Telephone hearing aids.jpg 2,048 × 1,536; 600 KB