I'm not sure how applicable this is, but, according to Wikipedia, the Otto-Mercedes was produced about 1923 by the Starnberger Automobilwerke, founded by Gustav Otto, son of the four stroke engine inventor Nikolaus Otto. Gustav Otto was involved in airplane manufacture, as well as automobiles, but apparently suffered from depression all his life, and committed suicide, at age 43, in 1926, after a messy divorce. I have been unable to locate any description of the automobile, other than the Otto-Mercedes.