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International Standard Category: Industrial process measurement and control

HG/T 20637.2-1998    Symbols and identifiers for engineering design of instrumentation
自控专业工程设计用图形符号和文字代号;
Category No.:25.040.40 Valid Status:superseded
Issued Organization:State Bureau of Petroleum and Chemical Industries Issued Date:1998-6-22
Implemented Date:1999-1-1 Abolished Date:2018-04-01
Superseded Standard.:HG/T 20637.2-2017 Symbols and identification for instrumentation engineering design
Superseded Date:2018-4-1
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