1997GOST 31.1066.04-1997 Attachments for metal-cutting tools. Cam arbors. General specifications
1972GOST 17528-1972 Spindle cam arbors. Design and dimensions
GOST 17528-1972 Spindle cam arbors. Design and dimensions was changed to GOST 31.1066.04-1997 Attachments for metal-cutting tools. Cam arbors. General specifications.