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NEMA PRP 4:2009 (R2016)
NEMA CC 1:2009 (R2015)
NEMA SG 4:2009 (R2013)
ANSI C 136.35:2009 (R2014)
NEMA MS 1:2008 (R2014)
IEC 61158-4-21 (2019-04)
API Spec 16A Errata 2
API Bull 1178
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