The first gasoline-powered lawn mower, 1902.
On this day, May 8th, 1921 the world’s first riding lawn mower, manufactured by the Ideal Power Mower Co. of Lansing, was first introduced in Fort Wayne (and other locations) for promotional purposes. The mower company was in business until 1945 when it was sold to the Indian Motorcycle Co.
Source : Detroit History Tours and Detroit History Club Facebook Page, May 8, 2016.