General Electric made the Bison motor for them. Richard Shaffer was President of Bison. Former V.C.C.C. board member, Clay Floyd, operated a service/repair center for Bison in the early 1970's (1973 to be exact). Mr. Shaffer flew from Florida to Denver to host sales meetings, recruit new salesmen, and generally drove Clay nuts. There was a hedge trimmer attachment shown in the demo books and 'coming soon' and tons of customers used to invade Clay's repair center demanding that attachment which they believed would be delivered by the salesman. No hedge trimmer ever was sold. Only pictured. Lots of angry customers. By the way, Dwane Chapman (the bounty hunter) sold Bisons through Clay's office at the time. Clay referred to his sales tactics as 'unscrupulous'. He pushed Bisons on old ladies, which Clay didn't approve of.