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Coal mining - Wikipedia, the free encyclopedia Coal-cutting machines were invented in the 1880s. Before this invention, coal was mined from underground with a pick ...

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Longwall Miner. Twenty percent to 30 percent of mined coal underground is from longwall mining. This is performed by a mechanical cutter that shears coal off from a ...

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Longwall mining - Wikipedia, the free encyclopedia. Longwall mining is a form of underground coal mining where a long wall of coal is mined in a ...

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