Drilling bits for boring holes and wells

Details Drilling bits for boring holes and wells Drilling bits for boring holes and wells

E - Fixed Constructions

21

B

255/72

E21B 17/10 (2006.01) E21B 10/08 (2006.01) E21B 10/24 (2006.01) E21B 10/50 (2006.01)

Patent

CA 994750

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