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hard hat safety construction work industrial protection headgear PPE personal protective equipment job site safety first hardhat construction worker engineer architect supervisor safety inspector workplace safety occupational safety industrial safety construction safety hard hat area safety zone restricted area authorized personnel only no hard hats beyond this point put on your hard hat safety is everyone's responsibility safety is our top priority we take safety seriously your safety is our concern safety is a way of life safety is the best policy safety is priceless safety is everything safety is success safety is life