Occupational safety standards system. Gas compressing equipment. General safety requirements
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Occupational safety standards system. Explosionproof electrical apparatus. Terms and definitions. Classification. Marking
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Occupational safety standards system. Ground equipment for well repair and realization. Safety general requirements
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Occupational safety standards system. Rigs for drilling exploration and hydrogeological holes. Safety requirements
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1:10 Conical shaft ends. Basis dimensions. Permissible torque
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