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In 1961, MSA released the Topgard Helmet, the first polycarbonate hard hat. 1962 brought the V-Gard Helmet, which today is the most widely used hard hat in the United States. [citation needed] Today, most hard hats are made from high-density polyethylene (HDPE) or advanced engineering resins, such as Ultem.
The development of hard hats for workplace safety may have been inspired by the helmets of WWI, and they have become a standard type of safety equipment on many construction job sites and industrial locations. Flight helmets were also developed throughout the 20th century.
Colloquially, it was called the shrapnel helmet, battle bowler, Tommy helmet, tin hat, and in the United States the doughboy helmet. It was also known as the dishpan hat, tin pan hat, washbasin and Kelly helmet. The German Army called it the Salatschüssel (salad bowl). [1] The term Brodie is often misused.
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Standard diving dress, also known as hard-hat or copper hat equipment, deep sea diving suit or heavy gear, is a type of diving suit that was formerly used for all relatively deep underwater work that required more than breath-hold duration, which included marine salvage, civil engineering, pearl shell diving and other commercial diving work, and similar naval diving applications.
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