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msha developed this proposed rule on proximity detection systems for mobile machines in underground mines proximity detection systems used on coal hauling
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... a census of mobile machines used in u. s determining the numbers of the major machine types used in surface coal mines and the workers' noise
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msha proposes rule requiring proximity detection systems on coal mines that may have been mining machines used to cut coal in
as coal mines shut, 'big iron' gets dirt cheap. peter turner, who operates coal mines in who traveled nearly 14,000 miles via europe to bid on the machines,
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