Glasses for eye-protective equipments; determination of the resistance to glowing substance, UV-rays as well as chemical and thermal influences— 2 стр.
Specification for welding filters with switchable luminous transmittance and welding filters with dual luminous transmittance; German version EN 379:1994— 7 стр.
Specification for welding filters with switchable luminous transmittance and welding filters with dual luminous transmittance; German version EN 379:1994— 7 стр.