Drilling or cutting of earth strata

Details Drilling or cutting of earth strata Drilling or cutting of earth strata

E - Fixed Constructions

21

B

255/35

E21B 19/084 (2006.01) E21B 7/24 (2006.01) E21B 10/40 (2006.01) E21B 15/04 (2006.01)

Patent

CA 935810

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