1992GOST R 50409-1992 Medium expansions foam-making branch pipes. Specifications
1980GOST 12962-1980 Medium expansion foam-making branch pipes. Specifications
0000 GOST 5.1061-1971
0000 GOST 12962-1967
GOST 12962-1980 Medium expansion foam-making branch pipes. Specifications was changed to GOST R 50409-1992 Medium expansions foam-making branch pipes. Specifications.