David Buick was a plumber before he built cars, draw your own conclusions.

Anybody here ever hear about the Seldon Patent??

Seldon patented the internal combustion engine and immediately started collecting fees from all the US automakers!!

One refused to pay and took his challenge of the patent to court and many years later won the case. Saving carmakers millions of dollars.
Any body want to guess who the carmaker was who refused to pay?

They're still in business today.