Coal loaders sit outside the Joy Manufacturing Factory. Caption on photo reads, 'Mine equipment suppliers are busy turning out machinery for mechanical mining. For example, Joy Mfg. recently went on double shift operation to speed up production of mining machinery.'
The National Mine Service Company granted an exclusive world-wide license to manufacture and sell a new type of shuttle car developed and patented by Pittsburgh Consolidation Coal Company. The shuttle car was designed by Arthur L. Lee and his engineering staff of Pitt-Consol.