1989GOST 12.4.041-1989 Occupational safety standards system. Means for individual protection of breathing organs. Specifications
0000 GOST 12.4.042-1978
GOST R 12.4.041-2001 Occupational safety standards system. Fil tering respiratory protective equipment. General requirements has been changed from GOST 12.4.041-1989 Occupational safety standards system. Means for individual protection of breathing organs. Specifications.