United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 421
. o />D.u*u ro PHOTO-LfTMOGBlPNEBS. WMH1IKJTOS. O C W. ZETSING. BEAKE FOR DISK TALKING MACHINES. APPLIOATION PILED JUNE 22, 1907. 959,682. IPig. 7. … IPig.9. Patented May 31,1910. 2 BiiEETS-SHEET 2.
Phonograph · Patents
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