Interior of the tool and ie building, Ford River Rouge plant, Dearborn Michigan. Here radically new techniques of mass production have been developed and put in use. Machine tools and dies produced at this plant themselves make mass production easier and more rapid in other factories throughout the country. The building covers 8 1/2 acres; employs 4,500 skilled workers; equipped with 3 million dollars worth of machinery. Many machinists are being trained for the Navy, here by mechanics, tool and die makers