Gideon Sundback, a Swedish-American electrical engineer, perfected the 'Separable Fastener' which we now call the zipper. While previous versions by Elias Howe and Whitcomb Judson were prone to jamming or popping open, Sundback’s version increased the number of fastening elements per inch and introduced a slider that wedged the opposing teeth together. The B.F. Goodrich Company coined the name 'Zipper' in 1923 because of the sound it made when used on rubber boots. The invention revolutionized the garment industry, eventually replacing buttons and laces on trousers, dresses, and luggage. It also became vital for military equipment, such as flight suits and sleeping bags, due to the speed and security with which it could be opened and closed.