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B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
B23F—MAKING GEARS OR TOOTHED RACKS
B23F7/00—Making herringbone gear teeth
FR565608D1922-04-291923-04-28
Improvements to the means for rounding the angles in the helical gears with chevrons cut by means of the end mill
ExpiredFR565608A
(en)