Russian standards
Unified system of design documentation. Graphical symbols in diagrams. Telephone sets, switchboards and switching telephone exchanges
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Unified system for design documentation. Graphical designations in diagrams. Signal technics
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Unified system of design documentation. Graphical identification on electric diagrams. Storage
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Unified system for design documentation. Symbolic representations. Pipeline accessories
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Unified system for design documentation. Graphic designations. Evaporating apparatuses
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Unified system for design documentation. Graphic designations. Heat exchangers
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