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Title: [Go to resource]
Description: Hearing aid in form of conversation tube, English(?), 1801-1910 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: hearing aids Temporal: 1801-1910 Source: Science Museum Identifier: A608245 Go to resource More Like this...-
Walsh's monaural stethoscope, English(?), 1801-1910Walsh's monaural stethoscope, English(?), 1801-1910
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Barron's monaural stethoscope, English(?), 1801-1910Barron's monaural stethoscope, English(?), 1801-1910
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