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any of various machines that modify the shape or size of a workpiece by rotating tools or the work: rolling mill. ... Mining. a place or set of machinery f

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Late 15th and early 16th century mining techniques, De re metallica. ... These are small machines that float on the water and are usually opera

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De Re Metallica, Georgius Agricola, 1550, Book I, Para. 1 [citation needed] Mining operations usually create a negative environmental impact, both during the

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