Late 1800s Coal Mining Equipment frauenarztvogt
Late 1800s mechanized mining equipment had been successfully in tro duced into many of Ohios underground coal mines From 1800 to about 1948 most of Ohios coal was mined un der ground During most of the 19th century coal was mined by 1850 1900 1950 2000 million tons 0 10 20 30 40 50 60 1930 1940 19 1990 2010.