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Title: Transistorised speech training hearing aid, type 16650, by A [Go to resource]
Description: Transistorised speech training hearing aid, type 16650, by Amplivox, London License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Creator: Amplivox (maker) Identifier: 1991-165/27 Go to resource More Like this...
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