Spiral drilling tool and method of its manufacture

Details Spiral drilling tool and method of its manufacture Spiral drilling tool and method of its manufacture

B - Operations, Transporting

21

B

77/30, 255/82

B21B 17/04 (2006.01) B23B 51/00 (2006.01) B23B 51/04 (2006.01) E21B 17/04 (2006.01) E21B 17/042 (2006.01)

Patent

CA 1025847

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