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B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
B23B—TURNING; BORING
B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
B23B31/02—Chucks
B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
B23B31/22—Jaws in the form of balls
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FR943502D1947-03-211947-03-21Perfectionnements aux mandrins pince-barres dans lesquels les mâchoires sont constituées par des billes ou des rouleaux
ExpiredFR943502A
(fr)