Category:Hearing aids of the 1920s
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Media in category "Hearing aids of the 1920s"
The following 5 files are in this category, out of 5 total.
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Bell telephone magazine (1922) (14569625968).jpg 1,742 × 2,624; 794 KB
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Bell telephone magazine (1922) (14569819567).jpg 1,702 × 2,612; 790 KB
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Museum of Medicine Berlin Germany Telephone hearing aids.jpg 2,048 × 1,536; 600 KB