Ray Kroc (who is really responsible for the growth of the McDonald's franchise) was a milkshake machine salesman. I believe he was introduced to the McDonalds b

Ray Kroc (who is really responsible for the growth of the McDonald's franchise) was a milkshake machine salesman. I believe he was introduced to the McDonalds brothers when selling them a milkshake machine that could mix multiple individual milkshakes at once. Edit: here's the "multimixer": http://www.sterlingmulti.com/multimixer_history.html http://www.sterlingmulti.com/multimixer_history.html