E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/46
E21B 23/08 (2006.01) E21B 33/00 (2006.01) E21B 33/16 (2006.01) E21B 43/14 (2006.01)
Patent
CA 895687
Ecuer John H.
Amoco Canada Petroleum Company Ltd.
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