United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 132
record and re- 30ceiving-blank phonograms, of diaphragms injuxtaposition thereto, provided with repro-ducing and cutting stjdi, and a conduit ofrarefied air connecting the two diaphragms,substantially as and for the purposes de- 35scribed. In testimony whereof 1 affix my signature,inpresence of two… … -J^i^ ^■
Phonograph · Patents
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