United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 969
grings arranged at the respective ends of thematrix and provided with internal annularchambers adapted to form pressure tight 45joints with the ends of the cylindrical phono-graph blank operated on, the said grooveshaving radial exit passages for the escape ofair therefrom. Signed at Chicago,… … ^=^r^?
Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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