Technical agate and chalcedony. Specifications
STANDARD published on 1.1.1971
Designation standards: GOST 15519-70
Publication date standards: 1.1.1971
The number of pages: 6
Approximate weight : 18 g (0.04 lbs)
Country: Russian technical standard
Category: Technical standards GOST
Implemented changes and corrections:
Amd. 11.72
Amd. 11.84