My wife's uncles invented those.
Brothers
Cyril and Louis Keller are recognized as the inventors of the compact, three-wheeled loader in 1957 in Rothsay, Minnesota. Designed for a turkey farmer to clean barns, this invention led to the creation of the first four-wheel drive skid-steer loader (M400) in 1960 and the iconic Bobcat brand. My wife's mother was a Keller.