Actually I believe you are right.
Though the history says:
"Research shows that the Mason Car Company was founded in about 1906 to build a car that was designed by the Duesenberg brothers. Fred L. Maytag and his son Elmer decided to enter into the automobile manufacturing business. They bought into the Mason Car Company and renamed it Maytag-Mason Motor Car Company. Waterloo,Iowa was now the base for operations around 1910. The company produced many different models of cars and trucks.. The company was only about two years old when it went out of business in 1912."
But the photo which has a caption of Maytag-Mason shows a Mason - if you look closely at the picture you can see it in the lower left hand corner:
Just my 2 cents. Otto, what do you say?