One of the most distinctive job-related articles is the hard hat. While a hard hat is ... This is where the blue hat workers come in. Workers wearing blue hats are technical specialists, brought ...

The company’s distinctive three-rib, heat-resistant fiberglass hard hat was developed in the 1940s. In the 1950s and 1960s, thermoplastics replaced fiberglass. In 1982, the standard hard hat ...

“These hats have one serious drawback, aluminum is a great conductor of electricity.” Bullard’s distinctive three-rib, heat-resistant fiberglass hard hat was developed in the 1940s. In the ...