United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 277
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- … Jttvervfor:
Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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