1905Yo-yos were sold by Llewellyn D. Lothrop on Duncan Street.People and Communities, Notable People, Legends & Lore

A toy consisting of an axle connected to two disks and a string looped around the axle, had been around since ancient times. Lothrop and his partner, Hans Libreich, were granted a patent for their version on October 16, 1906. The toy wasn’t named “yo-yo” until the late 1920s.
Mr. Lothrop also held patents on a hand-cranked foghorn, fishing swivel, and an improved tea kettle.
Institution, Smithsonian. “National Yo-Yo Day: June 6.” Smithsonian Institution. https://www.si.edu/spotlight/yo-yo.