Shaft drill break-out system

Details Shaft drill break-out system Shaft drill break-out system

E - Fixed Constructions

21

D

255/14.7

E21D 9/02 (2006.01) E02D 7/28 (2006.01) E21B 19/086 (2006.01) E21B 19/16 (2006.01) E21B 19/20 (2006.01)

Patent

CA 1035346

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