1993GOST 30086-1993 Jig bushes and accessories for drilling purposes. Dimensions
1984GOST 26234-1984 Normal and high precision renewable jig bushes. Design and dimensions
GOST 26234-1984 Normal and high precision renewable jig bushes. Design and dimensions was changed to GOST 30086-1993 Jig bushes and accessories for drilling purposes. Dimensions.