Originated as part of AS CA15—1961.Previous edition AS 1670.1—1995.AS 1670.1—1995 and AS 1670.2—1997 revised, amalgamated and designated as AS 1670.1—2004.Second edition AS 1670.1:2015. Originated as part of AS CA15-1961. Previous edition AS 1670.1-1995. AS 1670.1-1995 and AS 1670.2-1997 revised, amalgamated and designated as AS 1670.1-2004. Second edition AS 1670.1:2015.