E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
31/13, 166/31
E21B 43/24 (2006.01) C09K 8/592 (2006.01) E21B 43/20 (2006.01)
Patent
CA 929878
Fred H. Poettmann
Joe T. Kelly
LandOfFree
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