E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/26.1
E21B 43/00 (2006.01) E21B 33/10 (2006.01)
Patent
CA 920505
Blount Elmo M.
Messenger Joseph U.
Prueger Nicolas J.
Snavely Earl S.
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