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Title: Flexible tube hearing aid, 1801-1900 [Go to resource]
Description: Flexible tube hearing aid, 19th century, usually known as a conversation tube License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: aural aid Temporal: 1801-1900 Source: Science Museum Creator: Unknown maker Identifier: http://collectionsonline.nmsi.ac.uk/grab... Go to resource More Like this...
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