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INCITS 421:2006
IEC 60261 Ed. 2.0 b:1989
IEC 60870-3 Ed. 1.0 b:1989
IEC 60404-8-5 Ed. 1.0 b:1989
IEC 60574-17 Ed. 1.0 b:1989
INCITS 358 Draft
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