Glasses for eye-protective equipments; determination of the resistance to glowing substance, UV-rays as well as chemical and thermal influences— 2 стр.
Lamp housing for still picture projection and motion-picture projection; safety requirements for lamp housings for high-pressure discharge lamps and for safety equipment— 5 стр.
Glasses for eye-protective equipments; determination of the resistance to glowing substance, UV-rays as well as chemical and thermal influences— 2 стр.