Russian standards PDF
Civil defense. Engineering and technical equipment of civil defense protective structures. Pressure valves. General technical requirements. Test methods
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Civil defense. Engineering and technical equipment of protective structures of civil defense. Manual electric fans. General technical requirements. Test methods
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Refractory alumino-silicate block products for glass-making furnaces. Specifications
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Refractory heat-insulating fiberglass materials and products of mullite-silica chemical composition. Specifications
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