E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
182/74
E21B 43/08 (2006.01) E21B 43/04 (2006.01)
Patent
CA 955180
Bearden William G.
Howard George C.
Spurlock James W.
Amoco Canada Petroleum Company Ltd.
LandOfFree
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