Unified Systems of Design Documentation. Standard graphic symbols. Pipeline valves and fittings
Единая система конструкторской документации. Обозначения условные графические. Арматура трубопроводная |
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RD 10-40-93Model Guidelines for Engineers and Technicians … |
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GOST 380-71General-purpose carbon steel. Grades and … |
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FSSN 111Approval of Settlements Forms |