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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RFS 91nRecords of Non-Tangible Assetts |
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GOST 3262-75Steel pipes for water and gas lines. … |
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RDS 11-201-95Instruction On Procedure for the Conducting of … |