United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 1033
, in introducing a cheapmolten material within the rotating mold be-fore the surfacing layer has been entirelyhardened, and in continuing the rotation ofthe mold until the duplicate record as a whole 70has been set and hardened, substantially as .set forth. This specification signed and… … JTcgr.* J2p.Z
Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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