2004GB/T 6338-2004 Inverse dovetail cutters and dovetail cutters with cylindrical shanks
1986GB/T 6339-1986 Dovetail and inverse dovetail milling cutters with flatted parallel shanks
GB/T 6339-1986 Dovetail and inverse dovetail milling cutters with flatted parallel shanks was changed to GB/T 6338-2004 Inverse dovetail cutters and dovetail cutters with cylindrical shanks.