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B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
B23B—TURNING; BORING
B23B49/00—Measuring or gauging equipment on boring machines for positioning or guiding the drill; Devices for indicating failure of drills during boring; Centering devices for holes to be bored
B23B49/04—Devices for boring or drilling centre holes in workpieces
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FR615804D1926-05-081926-05-08Dispositif de centrage et de serrage pour le perçage automatique des manches de couteaux et objets similaires
ExpiredFR615804A
(fr)