United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 202
r or shield which covers the entireface of the diaphragm and has an openingthiough which the recording stylus projects,substantially as described. 7. A phonograph having a pivoted dia- 55phragm with a sound concentrating chamberon one side and a sound protector or shieldon the other through which… … J^2,
Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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