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You searched for: Date undated Remove constraint Date: undated Topical Subjects Coal-mining machinery. Remove constraint Topical Subjects: Coal-mining machinery. Topical Subjects Coal mines and mining. Remove constraint Topical Subjects: Coal mines and mining. Topical Subjects Coal miners. Remove constraint Topical Subjects: Coal miners.
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Miner running a continuous mining machine.
Two miners work with a machine to undercut coal.