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accident prevention accident statistics acetylene activities American Standards Association appliances approved Asso Association automatic Boiler building Bureau car safeties carried codes Conference construction counterweight CZECHOSLOVAKIA dangerous Department Division drum electric elevator car employer enclosure engineering equipment exits Factory Inspectorate federal fire floor freight elevators gates guards hazards height hoist hoistway inches industrial accidents Industrial Hygiene industrial safety inspec inspection installed Institute International Labour International Labour Office issued labour protection landing legislation less lift lighting load locking device machinery manufacturing material ment National Safety Council occupational Office Ontario operation persons employed plant premises pulleys purpose rails regulations ropes rules safe safety and health safety committees safety devices safety engineers safety gear safety movement safety organisation Section shaft doors shaftway SOUTH AFRICA specified speed governor stairway Standards suitable SWEDEN switch technical tion trade unions undertakings walls wire workers workplaces workrooms