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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 .
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.
Date/Time Thumbnail Dimensions User Comment; current: 08:37, 1 February 2013: 530 × 800 (55 KB): Fæ {{Information |description = {{en|''Rabbit Goes To Your Head- Hat Manufacture in Britain, 1940''<br/> This hat factory worker, surrounded by piles of hats, is forming the shape of the brim of the hats.
The Merrimac Hat Company was a prominent manufacturer of hats from the 1860s until the 1950s, employing up to 500 people in its manufacturing facilities in Amesbury, Massachusetts and another 1,500 in facilities from Alabama to Nova Scotia. [1]
Battersby's Hat Works as it appeared in 2009.. Battersby Hats was the trading name of Battersby & Co, a hat manufacturer of Stockport, England.The firm once had a capacity of 12,000 hats per week but it declined in the second half of the twentieth century and merged with other hat manufacturers in 1966 before hat production ceased altogether in 1997.
The usual meaning of diving helmet is a piece of diving equipment that encases the user's head and delivers breathing gas to the diver, but the term "diving helmet", or "cave diving helmet" may also refer to a safety helmet like a climbing helmet or caving helmet that covers the top and back of the head, but is not sealed.
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Construction worker wearing an MSA Skullgard hard hat at Douglas Dam, Tennessee (), 1942. Mine Safety Appliances, or MSA Safety Incorporated, is an American manufacturer and supplier of safety equipment designed for use in a variety of hazardous conditions in industries such as construction, the military, fire service, and chemical, oil, and gas production.