E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
61/67
E21D 23/18 (2006.01)
Patent
CA 832741
Belov Nikolai Pavlovich
Makarov Nikolai Ilich
Martynov Boris Vasilievich
Peker Lev Ilich
Polei Leonid Semenovich
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