E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/13, 121/20
E21B 4/14 (2006.01)
Patent
CA 924198
Alexandr D. Kostylev
Alexandr N. Reinsburg
Boris V. Sudnishnikov
Konstantin K. Tupitsin
Konstantin S. Gurkov
LandOfFree
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