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Hard hats began as tar covered hats to protect builders and dockworkers.
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Franz Kafta created the 1st mass produced hard hat for everyine to buy and wear.
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A Californian mining compnay sold leather hard hats commercially.
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The same mining company was employed by the U.S. Navy to mass produce metal and hard boiled hard hats.
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The hard hat was worn by workers on the Hoover dam.
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All workers on the Golden Gate Bridge were required to wear hard hats.
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Hard hats began to be commercially sold which were made of aluminium.
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In the 1940's hard hats were made of fibreglass.
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Hard hats were started to be produced with thermoplastics because they are light, flourescent, can withstand lots of pressure and heat.
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The Modern hard hats were finally produced, there were several features implemted including the V-straop and other safety features.