On 15 May 1940, nylon hose went on sale at stores throughout the USA. Competing producers bought their nylon yarn from E.I. du Pont de Nemours and Company (later DuPont). W.H. Carothers, of DuPont, developed nylon, called Polymer 66, in 1935. It was the first totally man-made fiber and over time was substituted for other materials and came to have widespread application.
Image: CC 4.0, International Erik Liljeroth Nordiska Museet