Oil well derrick with guide track for travelling block dolly

Details Oil well derrick with guide track for travelling block dolly Oil well derrick with guide track for travelling block dolly

E - Fixed Constructions

21

B

20/110, 255/17

E21B 19/04 (2006.01) B66C 23/60 (2006.01) E21B 15/00 (2006.01)

Patent

CA 952896

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