Iron mines and mining--Iron County (Utah); Mining machinery; Utah International, Inc.
Display of rotary tric-cone bit used with Stanton carbide. Used for drilling holes in very hard iron ore. Holes were then loaded with explosives. On picture, " Oct. 25 1952 #66289 482" 22 1/4 HR."
Iron mines and mining--Iron County (Utah); Mining machinery; Utah International, Inc.
Pictures the development of a new highway truck from Euclid. This truck implemented twin transmissions, which preceded the development of larger engines and larger transmissions.