Originated as AS C97-1942, and AS1966.3-1990.AS C97 revised and redesignated AS 1966-1976.AS 1966 revised and redesignated AS 1966.1-1985 and AS 1966.2-1985.AS 1966.1-1985, AS 1966.2-1985 and AS 1966.3-1990 revised and redesignated AS 60974.1-2006. Originated as AS C97-1942, and AS1966.3-1990. AS C97 revised and redesignated AS 1966-1976. AS 1966 revised and redesignated AS 1966.1-1985 and AS 1966.2-1985. AS 1966.1-1985, AS 1966.2-1985 and AS 1966.3-1990 revised and redesignated AS 60974.1-2006.