E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/44, 251/81
E21B 43/12 (2006.01) E21B 34/08 (2006.01) E21B 41/00 (2006.01) E21B 34/00 (2006.01)
Patent
CA 1014851
Bailey Edmond I.
Parker William H.
LandOfFree
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