Under Revision See DR 96287 First published as part of AS 1660.3-1974.AS 1660.4 first published 1974.AS 1660.3-1974 and AS 1660.4-1974 revised, amalgamated and designated in part as AS 1660.3-1986.Third edition 1993. First published as part of AS 1660.3-1974. AS 1660.4 first published 1974. AS 1660.3-1974 and AS 1660.4-1974 revised, amalgamated and designated in part as AS 1660.3-1986. Third edition 1993.