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.
1 Chapman Tools (Durham, CT): midget ratchets and adaptors for Allen, Bristol, Phillips, and TORX fasteners since 1936 to repair and service everything from firearms to appliances, computers to dental equipment.  Craftsman brand hand tools, made for SEARS by Danaher Tool Group, are now a mix of USA-made and imported.