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Record/reproduce indicator

Patent drawing of a Bettini phonograph showing a cylindrical mandrel labeled A and C beneath an angled tone-arm assembly with mouthpiece M, diaphragm ring N, and spider S holding two styluses, with a small dual-faced weight indicator labeled 'Recording' and 'Reproducing' shown separately above.

PHONOGRAPH.Gianni Bettini · December 20, 1892

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