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See Chinese contents: GB/T 2625-1981 GB/T 2625-1981: Process detection and controlflow chart. Symbols and letter codes
This standard is applicable to chemical industry, petroleum industry, metallurgical industry, electricity industry, light industry, textile industry, building materials industry and other industries. It aims at specifying unified representation method for the instrument devices used in process detection and control flow chart. The symbols and letter codes specified in this standard may also be used in other design and technical documents.
