caterpillar tractor and travelling crane collect black coal to one big pile on supply field of thermoelectric power station

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bridge-crane bucket bulldozer bunker coal coal field crane crawler dozer earth mover economics economy electric energetics energy engineering excavator generate generating ground heap heat heavy industrial industry landfill load mineral mining mound overhead pile plant power production push-type scraper rake up reserve resource scoop scraper shovel station stock store supply thermal travelling
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