United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 197
hereof I hereunto set mysignature. BERTRAM M. HANSEN. Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. Vun/irnurnuwa rh i an 1 / ijfjjjj-rjf SOUND MODIFIER FOR PHONOGRAPHS. 1,253,40? — ■ P. MacA, Ma-cCaskie, Patented Jan. 15,…
Phonograph · Patents
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