United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 497
s in depositing upon thesurface of a non-magnetic tablet a thin line ortracing produced thereon by the crumblingaction of a magnetic needle while the latter isbeing actuated in accordance with sound-waves. In testimony whereof I have signed thisspecification in the presence of two subscrib-ing… … JJ&z = =» c- => — I fJ V E1n| T Q R i7AttY TH* HORRIS PETERS CO.. WASHINGTON. D. C. UNITED STATES PATENT OFFICE. WILLIAM W. ROSENFIELD, OF NEW YORK, N. Y. PHONOGRAPH. No. 831,895. Specification of Letters Patent. Patented Sept. 25, 1906. Application filed November 28, 1903. Renewed February…
Phonograph · Patents
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