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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 .
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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.
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A logarithmic chart allows only positive values to be plotted. A square root scale chart cannot show negative values. x: the x-values as a comma-separated list, for dates and time see remark in xType and yType; y or y1, y2, …: the y-values for one or several data series, respectively. For pie charts y2 denotes the radius of the corresponding ...
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to the end of the template code, making sure it starts on the same line as the code's last character. Pages in category "Bar chart templates" The following 26 pages are in this category, out of 26 total.
- The list items. Note: the list items will be sorted by their dates, not their parameter numbers. date1, date2, date3... - The dates for each list item. date1 corresponds to item1, date2 corresponds to item2, etc. class - a class attribute for the list's ul element. style - inline CSS for the list's ul element. highlighter - a custom highlighter.