GOST 8820-1969 Grinding stone exit grooves. Shape and sizes
GOST 8908-1981 Basic norms of interchangeability. Standart angles and angle telerances*, 1981-04-19 Update
GOST 9.073-1977 Unified system of protection against corrosion and aging. Metallic and non-metallic inorganic coatings. Types, thickness rows and designations