United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 281
ress against similarly-inclinedshoulders of each pair, whereby relative ro-tary movement of the sections in either di-rection causes relative longitudinal move-ment thereof and locks them rigidly together,substantially as set forth. This specification signed and witnessedthis 20th day of February,…
Phonograph · Patents
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