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27.3 MB (4.0 MB compressed)
3189 x 2991 pixels
26.9 x 25.4 cm ⏐ 10.6 x 10.0 in (300dpi)
COLLECTION ABECASIS / SCIENCE PHOTO LIBRARY COLLECTION ABECASIS / SCIENCE PHOTO LIBRARY
19th Century hearing aid. Illustration of a 19th Century design for an early hearing aid. Published in 'Physique populaire' by Emile Desbeaux (1891).
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