United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 572
ed diaphragm chamber forphonographs, comprising a central, cylindri-cal, longitudinal bore having its lower endflared, and a convex curved annular chambersurrounding thelower end of the central bore,substantially as and for the purpose specified. In testimony whereof I affix my signature in…
Phonograph · Patents
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