Above Buster Keaton enacts a common concept that a Model T had to be put down like a horse when it's useful life was over, because like a horse, it was all give and no take, all heart.
1929 and 1924
the wheel chair has an attached power wheel, looks like something I just watched on the History channel show "American Pickers" an interesting show I like to try to catch. Also similar to the Briggs and Stratton motor wheel For a timeline of power wheels and powered bicycles: http://www.mopedarmy.com/wiki/Motorized_Bicycle
Photos via: http://fantomatik75.blogspot.com/