E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/10 (2006.01)
Patent
CA 2281237
Rod guides for maintaining a rod of a sucker rod string in substantially central position in a well tubing during reciprocal movement of the sucker rod string in the well tubing.
Blake Cassels & Graydon Llp
Sable Donald E.
LandOfFree
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