Primary transfer sub for dual concentric drillpipe

Details Primary transfer sub for dual concentric drillpipe Primary transfer sub for dual concentric drillpipe

E - Fixed Constructions

21

B

285/15, 255/24

E21B 21/12 (2006.01) E21B 4/14 (2006.01) E21B 6/00 (2006.01) E21B 17/18 (2006.01) E21B 21/00 (2006.01)

Patent

CA 951715

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