Electrical engineering; classification of environmental conditions; classification of groups of environmental parameters and their severities; stationary use at non-weatherprocted locations; identical with IEC 60721-3-4:1987
Optics and optical instruments - Environmental test methods - Part 20: Humid atmosphere containing sulfur dioxide or hydrogen sulfide (ISO 9022-20:1997)— 6 стр.
Optics and optical instruments - Environmental test methods - Part 20: Humid atmosphere containing sulfur dioxide or hydrogen sulfide (ISO 9022-20:1997)— 6 стр.