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Explanation of Coal-Cutting ... a coal-cutting machine is a coal-cutter jig, which consists of a guiding frame and a cutting chain, made of knuckles with teeth ...

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Aug 14, 1973 · A method for cutting a deep kerf in a vein of frangible mineral whereby a cutter bar is sumped into a mineral vein at a rate to cut by all bits in a sequential plurality of bit patterns and then the c

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History . The mechanization of coal mining with cutting technology occurred as early as 1860. The first cutting machines were simple devices comprised of circular saws with picks positioned around edge instead of teeth.

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