In 1944 alone, the United States built more planes than the Japanese did from 1939 to 1945. By the end of the war, more than half of all industrial production in the world would take place in the United States.
The welt-beating and slashing machine ensures the welt is parallel to the insole. The outsole is then covered with rubber cement and attached to the upper using a sole-laying machine. The sole is stitched to the rest of the shoe using a lockstitch machine, capable of making 1,000 stitches in a minute.
One of the primary ways of distinguishing different types of fitness equipment is by the type of exercise. For example, athletes interested in aerobic exercise can choose from a variety of machines, including treadmills, row machines and elliptical trainers.