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The coal industry of Illinois has its origins in the middle nineteenth century, when entrepreneurs such as Jacob Free found out coal in locations which include Sangamon County. Jacob Bunn contributed to the event with the Illinois coal industry, and was a founder and owner on the Western Coal & Mining Company of Illinois. About 68% of Illinois ha

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The IEC 60825 sequence provides guidance on security associated with exposure of the attention to lasers, which are high luminance resources. The IEC 62471 series gives guidance for analyzing the photobiological safety of lamps and lamp programs which include luminaires. Precisely it specifies the exposure limitations, reference measurement procedu

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