First published as part of ASCA18-1968.
Revised and redesignated as part of AS1851.2-1976.
AS1851.2-1976, revised and redesignated AS2441-1981.
Fourth edition 2005.
Reconfirmed 2018. First published as part of AS CA18-1968. Revised and redesignated as part of AS1851.2-1976. AS1851.2-1976, revised and redesignated AS2441-1981. Fourth edition 2005. Reissued incorporating Amendment No. 1 (May 2009).