: An electric drill made by the Jeffrey Manufacturing Company of Columbus, Ohio, was used to put holes in the face of this coal seam. Explosives were inserted in the holes and detonated to knock the coal down. This photograph was taken at the Hatfield Campbell Creek Coal Company, Glomar, Kentucky, 1930. View on Ohio Memory.
: AL01527 Subjects
: Jeffrey Manufacturing Company (Columbus, Ohio); Mining machinery; Ohio Economy--Economy--Business Places
: Glomar (Kentucky)