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heavy equipment refers to heavy-duty vehicles specially designed for executing construction tasks most frequently ones involving earthwork operations

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chapter 82 - metal processing and metal working industry

the metal smelting and refining industry processes metal ores and scrap metal to obtain pure metals the metal working industries process metals in order to

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a abutment - in coal mining 1 the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides which act as abutments of the arch

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