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http://www.google.com.au/patents/US2151706?utm_source=gb-gplus-share
Patent US2151706 - BONE-CONDUCTION HEARING-AID V
BONE-CONDUCTION HEARING-AID V
Hugo Ueber et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 2151706
Filing date
: 18 Jul 1933
Issue date
: 28 Mar 1939
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