Ключевые слова: anthracite coal, black, brown coal, cave, cellar, chain conveyor, coal, coal mine, coal mine excavator, conveyor, cut, dark, drum, dungeon, engineering, excavator, exploitation, extraction, factory, fuel and power generation, geology, guido, horizontal, hydraulic, illuminated, indoors, industry, longwall, longwall mining, machine, mine workings, mineral, mining, movable, poland, raw material, rock, roof supports, rotate, science, shearer, shield, tunnel, underground, zabrze,