E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/13
E21B 4/06 (2006.01)
Patent
CA 1027928
Klimashko Vladimir V.
Kostylev Alexandr D.
Rozhkov Leonid G.
Terin Vladimir M.
Tkach Khaim B.
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