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1. GOST 2.709-89
Unified system of design documentation. Conventions of wires and terminal connections of electrical elements, equipment and sub
circuits in circuit diagrams
ГОСТ 2.709-89
Единая система конструкторской документации. Обозначения условные проводов и контактных соединений электрических
элементов, оборудования и участков цепей в электрических схемах
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