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 51-66-83Prevention of Pollution of Arctic and Far East … |
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GOST 21.405-93Rules of drawing up working documentation for … |
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OST 39-225-88Water for flooding oil reservoirs. Quality … |