E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/12, 255/50
E21B 7/26 (2006.01)
Patent
CA 1025846
Orekhov Anatoly A.
Svirschevsky Valentin K.
Tregubov Boris G.
Trofimuk Andrei A.
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