United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 609
n ofthe sound wave at a predeternnned posi-tion with respect to the receiver, and light- 80ing means located at opposite sides of thechamber, substantially as described. In testimony whereof, I have signed myname to this specification in the presenceof two subscribing witnesses. SYDNEY I. PRESCOTT.… … F\Gi 2
Phonograph · Patents
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