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 ...

“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 ...

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 ...