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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 (1900)

Bettini Phonograph Laboratory · New York : Bettini Phonograph Laboratory · leaf 13

An illustration from 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, 1900, leaf 13
BETTINI SPEED INDICA¬ BETTINI TOR No. I. UNIVERSAL For Class M and S M and PHONOGRAPH and H Phonographs, show¬ GRAPHOPHONE ing speed at 120 revo¬ SPEED INDICATOR lutions a minute . . $ 5.00 5.00 No. 2 CLOTH COVERS FOR MACHINES.$ 1.50 (Please mention type of machine when ordering.) PARTS AND…

Trade catalogs · Sound recordings · Phonograph · Bettini Phonograph Laboratory

Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.

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