On August 20, 1912, Edison received U.S. patent No. 1036470 for a “Phonographic Apparatus,” and patent No. 1036471 for a “Storage Battery” Phonograph is a…
On August 20, 1912, Edison received U.S. patent No. 1036470 for a “Phonographic Apparatus,” and patent No. 1036471 for a “Storage Battery” Phonograph is a…