1998GOST 30273-1998 Circular and rectangular electromagnetic chucks. General specifications
1987GOST 17519-1987 Rectangular electromagnetic chucks. General specifications
0000 GOST 17519-1981
GOST 17519-1987 Rectangular electromagnetic chucks. General specifications was changed to GOST 30273-1998 Circular and rectangular electromagnetic chucks. General specifications.