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بیشترCoal mining is the process of extracting coal from the ground. Coal is valued for its energy content, and, since the 1880s, has been widely used to generate electricity.
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بیشترUNDERGROUND MINE ELECTRICIAN . 1 Test ... and has satisfactorily completed a coal mine electrical training program ... in a non-coal mine, in the mine equipment ...
بیشترCoal Mining Equipment ... Coal is used as a traditional source of fuel as well as a generator of electricity. Coal mine equipment has been modified and refurbished ...
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