Quality ratings system. Conveyers. Quality characteristics nomenclature
NORMA vydaná dňa 1.1.1987
Designation standards: GOST 4.21-85
Publication date standards: 1.1.1987
The number of pages: 16
Approximate weight : 48 g (0.11 lbs)
Country: Russian technical standard
Kategória: Technické normy GOST
Implemented changes and corrections:
Amd. 4.87