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.
The most common, and the best known, piece of measuring equipment is the ordinary rule. The rule or tape is used for measuring where accuracy is not an extremely critical factor. They can be rigid or flexible, come in various lengths, and can be made of wood, metal, cloth, fiberglass... A rule, is an instrument used in geometry, technical drawing and engineering/building to measure distances and/or to rule straight lines.