E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/28
E21B 19/16 (2006.01) E21B 10/46 (2006.01) E21B 17/00 (2006.01) E21B 17/04 (2006.01) E21B 17/10 (2006.01) E21B 17/22 (2006.01)
Patent
CA 983472
Marx Claus
Ostertag Alfred
LandOfFree
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