United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 275
uring theset()<»eth(>r. substantially as specifiod. ^ A diaphragm composed of sheet fibrousmaterial, a center post of similar materialcarried bv the diaphragm, a waterproofcoating surrounding the diaphragm and the center post and securing these together, anda (rasket of lead Avire at the edge…
Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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