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In Europe all hard hats must have a manufacturer set lifespan, this can be determined from the expiry date or a set period from the manufacture date, which is either stuck to the inside or embossed in the hard hat's material.
By 1886, Stetson's hat company was the largest globally and had mechanized the hat-making industry ("producing close to 2 million hats a year by 1906"). [2] The Stetson Hat Co. ceased production in 1968 and licensed another hat company. [2] However, these hats still bear the Stetson name, with the hats produced in St. Joseph, Missouri.
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.
The M1935 design was slightly modified in 1940 to simplify its construction, the manufacturing process now incorporating more automated stamping methods. The principal change was to stamp the ventilator hole mounts directly onto the shell, rather than utilizing separate fittings. In other respects, the M1940 helmet was identical to the M1935.
A 2008 systematic study showed that helmets reduce the risk of head injury by around 69% and the risk of death by around 42%. [10]Although it was once speculated that wearing a motorcycle helmet increased neck and spinal injuries in a crash, recent evidence has shown the opposite to be the case: helmets protect against cervical spine injury.
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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