GB/T 18659-2023 Guidelines for the use of electromagnetic flowmeters for measuring fluid flow in closed pipes has been changed from GB/T 18660-2002 Measurement of conductive liquid flow in closed conduits--Method using electromagnetic flowmeters.
GB/T 18659-2023 Guidelines for the use of electromagnetic flowmeters for measuring fluid flow in closed pipes has been changed from GB/T 20729-2006 Measurement of conductive liquid flow in closed conduits Flanged electromagnetic flowmeters Overall length.
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