First published as part of AS 1924.1-1976.Second edition 1981.AS 1924.2 first published 1981.Part of AS 1924.1-1981 and AS 1924.2-1981 revised, amalgamated and redesignated as AS 4685.4-2004. Originated as part of AS 1924.1-1976. Previous edition AS 1924.1-1981 and AS 1924.2-1981. Part of AS 1924.1-1981 and AS 1924.2-1981 revised, amalgamated and redesignated as AS 4685.4-2004.