GOST 12.4.159-1990 Occupational safety standards system. Means for individual protection of breathing organs. Methods of testing all-service canisters protection time against noxious gaseous contaminants
1990GOST 12.4.159-1990 Occupational safety standards system. Means for individual protection of breathing organs. Methods of testing all-service canisters protection time against noxious gaseous contaminants