I don't think they were under the same umbrella, at one point they sued each other over a patent. Stoddard decided to play with automobiles becoming Maxwell , later the factory went to Dodge Bros.
Ohio Rake just seems to vanish without a trace...
I suppose Stoddard may have dumped ag impliments when it decided to play with automobiles, in which case Ohio may have aquired some articles made previously by Stoddard...but only speculation...
Edit:
Worth noting perhaps that Ohio Rake seems to have liked picking up machine lines from others.
They are listed as having aquired a Corn seeder and a harrow from Gale, Sulky & Walking plows from Moore Plow & Impl. co, and Cultivators and Disc Harrows from Collins.