2004QJ 1284.2A-2004 Specification for ammonia heat pipe made of axially-groove aluminium and aluminium alloy
1987QJ 1284.2-1987 Aluminum and aluminum alloy axial groove heat pipe
QJ 1284.2A-2004 Specification for ammonia heat pipe made of axially-groove aluminium and aluminium alloy has been changed from QJ 1284.2-1987 Aluminum and aluminum alloy axial groove heat pipe.