: Display of products made by the Jeffrey Manufacturing Company of Columbus, Ohio at the American Mining Congress held in Cincinnati, Ohio, 1927. The two boxes seen on the floor are electric locomotive speed controllers. On the right is an electric mining machine mounted on a Handitruck, a wheeled cart used to move the machine from place to place in a mine. Jeffrey Manufacturing Company was celebrating its fiftieth anniversary in 1927. View on Ohio Memory.
: AL01486 Subjects
: Mining machinery; Ohio Economy--Economy--Business Places
: Cincinnati (Ohio)