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B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
B23G1/00—Thread cutting; Automatic machines specially designed therefor
B23G1/22—Machines specially designed for operating on pipes or tubes
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FR452453D1912-01-111912-12-27Perfectionnements dans les machines à tourner, faconner et fileter des tiges et autres ébauches en métal
ExpiredFR452453A
(fr)
Perfectionnements aux machines à faire les ourlets sur les bords des feuilles de métal, dans la fabrication des boites métalliques et articles similaires