File:GEM 72-T hearing aid 1954 front view with ruler and ear piece.jpg
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![File:GEM 72-T hearing aid 1954 front view with ruler and ear piece.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c1/GEM_72-T_hearing_aid_1954_front_view_with_ruler_and_ear_piece.jpg/719px-GEM_72-T_hearing_aid_1954_front_view_with_ruler_and_ear_piece.jpg?20191229044106)
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