First published in part as AS 1273.1-1974.AS 1273.2 first published 1974.AS 1273.1-1974 and AS 1273.2-1974 revised, amalgamated and redesignated AS 1273-1991.Reconfirmed 2018. First published as AS 1273.1-1974 and AS 1273.2-1974. Revised, amalgamated and redesignated AS 1273-1991.