Boxes and enclosures for electrical accessories for household and similar fixed electrical installations. Part 21. Particular requirements for boxes and enclosures with provision for suspension means
Occupational safety standards system. Protective clothing against chemicals. Test method for resistance of materials to permeation by liquids and gases
Vessels and apparatus. Norms and methods of strength calculation. Reinforcement of openings in shells and heads under internal and external pressure. Strength calculation of shells and heads under external static loads on the nozzle
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