Yours, Etc.: Origins and Uses of 8 Sign-Offs
"automatic coin-operated public laundry," 1946, originally (1942) a proprietary name by Westinghouse for a type of automatic washing machine; from laundry + ending probably suggested by automat. Also used for public clothes-washing places in U.S. were washateria (1935), laundrette (1945). The Westinghouse machine was popular after the war and was available with coin chutes and timers.