United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 275
JCx&3. … E. L. GREENSFELDER. METHOD AND APPARATUS FOR SYNCHRONOUSLY PRODUCING SOUNDS TO ACCOMPANY MOTION PICTURES. APPLICATION FILED MAR. 30. 191b. 1,254,684. Patented Jan. 29,1918. Ity.4. 4 SHEETS-SHEET 2. 40-
Phonograph · Patents
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