United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 577
ular corruga-tion about the center at a substantial dis-tance from the outer edge, and a series of ra-dial corrugations extending from the centerof the diaphragm to said annular corruga-tion, said corrugations forming a central stiff-ened vibratory portion. In testimony of which invention I… … WITNESSES: I Fig. 6. Fig .7
Phonograph · Patents
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