E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
121/3, 121/7, 17
E21B 6/00 (2006.01) B25D 9/10 (2006.01) E21B 1/34 (2006.01)
Patent
CA 991036
Brannstrom Kurt O.
Karlfors Levi J.
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