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.
Hereâs How Nikeâs (Real) Self-Lacing Marty McFly Shoes Work. Five years ago, Nike patented the Marty McFlysâyou know, the self-lacing shoes from Back to the Future. But that was just a patent (which you can find in full here). Companies patent lots of things, crazy things, insane things that never have the slightest chance of becoming reality.