E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/08 (2006.01) E21B 7/20 (2006.01) E21B 19/16 (2006.01) E21B 33/04 (2006.01)
Patent
CA 2718929
Fernandes Denis Robert Mario
Niven David
Marks & Clerk
Weatherford/lamb Inc.
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