GOST 17378-2001 Carbon and low-alloy steel butt-welding fittings Reducers Design.
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GOST 17378-2001 Carbon and low-alloy steel butt-welding fittings Reducers Design.
GOST 17378-2001 Carbon and low-alloy steel butt-welding fittings Reducers Design.
Детали трубопроводов бесшовные приварные из углеродистой и низколегированной стали. Переходы. Конструкция
