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>A true mirror of sound : Bettini micro-phonograph, micro-diaphragms for phonograph and graphophone, Bettini celebrated 'opera musical records' and autograph-records of world famous artists
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A true mirror of sound : Bettini micro-phonograph, micro-diaphragms for phonograph and graphophone, Bettini celebrated 'opera musical records' and autograph-records of world famous artists