E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/13, 121/20
E21B 4/06 (2006.01)
Patent
CA 1025843
Borshtein Mikhail V.
Chepurnoi Nikolai P.
Cherednikov Evgeny N.
Galbinshtein Alexandr N.
Gurkov Konstantin S.
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