Drill head in a coal mine. Coal mining underground
Schlüsselwörter
coal,
mine,
drill,
inside,
harvester,
technology,
black,
work,
shield,
factory,
industry,
engineering,
underground,
rock,
iron,
geology,
mineral,
machine,
machinery,
equipment,
industrial,
power,
cave,
mining,
hydraulic,
track,
chisel,
tunnel,
extraction,
cellar,
miner,
horizontal,
exploitation,
shaft,
dig,
cutter,
dark,
indoor,
hard,
borer,
excavate,
heavy
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