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Kohle
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World's longest single flight belt conveyor
Use of pulverized coal as steamship fuel
Use and handling of mine cars in british collieries
Unit train -- Planning, operating, financing
Underground photography as aid to accident prevention
Underground haulage with locomotives and mine cars
Underground haulage by locomotives
Transportation problem solved with belt conveyors
Transportation of coal slurries in pipelines
Track-mounted surge cars speed entry development