E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/44
E21B 49/08 (2006.01) E21B 34/10 (2006.01) E21B 47/00 (2006.01) E21B 49/00 (2006.01) E21B 34/00 (2006.01)
Patent
CA 984287
Holden John C.
Wray Gary Q.
LandOfFree
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