E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/41, 166/67
E21B 34/12 (2006.01) E21B 33/128 (2006.01)
Patent
CA 748703
John A. Haeber
Raymond F. Perner
Richard J. Bauer
Na
Shell Oil Company
LandOfFree
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