Under Revision See DR 95009 First published as AS C412-1970.Second edition 1973.Revised and redesignated AS 1972-1976.AS C412 withdrawn 1978.Second edition AS 1972-1991. First published as AS C412-1970. Second edition 1973. Revised and redesignated AS 1972-1976. AS C412 withdrawn 1978. Second edition AS 1972-1991.