E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/13
E21B 4/14 (2006.01)
Patent
CA 956297
Chepurnoi Nikolai P.
Gurkov Konstantin S.
Klimashko Vladimir V.
Kostylev Alexandr D.
Nazarov Nikolai G.
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