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The hearing aid. From the artwork by Emile Desbeaux " Popular Physics " 1891 "Physique
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The hearing aid. From the artwork by Emile Desbeau...

Hearing of the Edison phonograph in the Paris Universal Exhibition of 1889 From " Popular physics
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Hearing of the Edison phonograph in the Paris Univ...

Music recording - 19th century
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Music recording - 19th century