First published as part of AS B81-1941.AS B81.2 first published 1954.AS B81-1941 revised and redesignated as AS B81.1-1955.Second edition AS B81.1-1963.Second edition AS B81.2-1968.AS B81.2-1968 revised and redesignated as AS 1816.2-1976.AS B81.1-1963 revised and redesignated as AS 1816.1-1977.AS 1816.1-1977 and AS 1816.2-1976 revised, amalgamated and redesignated as AS 1816-1990.AS 1816-1990 revised and redesignated in part as AS 1816.1-2002.Second edition 2007.Reconfirmed 2017. Originated as part of AS B81-1941. Previous edition AS 1816.1-2002. Second edition 2007.