Advances lead to tougher, more durable hard hat.
Bross
M S
MS
E.D. Bullard Co., Sausalito, Calif.
D000062:Accidents, Occupational / Q000517:prevention & control*; D006259:Craniocerebral Trauma / Q000517:prevention & control*; D004867:Equipment Design; D006260:Head Protective Devices / Q000592:standards; D006801:Humans; D014481:United States