United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 641
m diameter which comprisesthe insertion of a cylindrical blank shellwithin a suitable matrix, and the expansion of such shell into such matrix along the en-tire length of such shell and in the progress-ive manner described, and in the presence ofa local softening influence. Signed at Chicago,… … J2F!i^r.fi
Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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