First published as AS/NZS 2161.5:1998. Originated in Australia as part of AS Z4-1952. Final Australian edition part of AS 2161-1978. Originated in New Zealand as part of NZS 1988:1965. Final New Zealand edition part of NZS 5812:1982. AS 2161-1978 and NZS 5812:1982 jointly revised, amalgamated and redesignated in part as AS/NZS 2161.5:1998.