United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 140
nograph, thecombination, with the phonograph-diaphragmand recording-stylus, of a microphone ar-ranged to be operated simultaneously withthe phonograph-diaphragm, armatures con-nected with the recording-stylus, and fin elec-tro-magnet arranged to act upon the said ar-mature and placed in the circuit… … f K r Fi^A A
Phonograph · Patents
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