Stanley Hiller Jr. was an aviation pioneer in the development of helicopters from the 1940s to the 1960s. In the mid-1950s, Hiller developed and sold a small yard tractor named the Hiller Yard Hand. The Yard Hand was also sold by Sears as a Craftsman model yard tractor. Hiller stopped production by 1960.
Hiller Yard Hand - at Yahoo Groups
Hiller Aviation Museum - official site