Drill stem make-up and break-out system for earth drilling...

Details Drill stem make-up and break-out system for earth drilling... Drill stem make-up and break-out system for earth drilling...

E - Fixed Constructions

21

B

342/24, 255/14.7

E21B 19/20 (2006.01) E21B 19/086 (2006.01)

Patent

CA 1015738

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