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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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FR46403A1965-09-201965-09-20Perfectionnements aux dispositifs pour l'usinage des centres sur des pièces mécaniques ou analogues
ExpiredFR1458548A
(fr)