?? ???? ??? ??? ??, ???? ???? ? ? ??? ? ????. ??, ????? ???? ?? ??? ?? ?? ???? ?? ?????. ???? ???? '???'? ??? ??? ???? ???? '???'???? ??? ???? ??? ??? ???? ???. ??, ???? ??? ? ?? ??? ??? ?? ????, ???? ???? ???? ??? ??? ????. ?? ???? ?? ??/?? ?? ?? ??/?? ??/?? ?? ???? In 1817, coal was first discovered and steadily turned used since the fuel to