United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 664
n depth representing 25sound waves, substantially as described. 5. A copjof a fiat sound record, which con-sists of a disk of hard rubber having im-pressed upon its face the lines representing therecord, substantially as described, 30 In testimony whereof I have affixed my sig-nature in presence of…
Phonograph · Patents
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