[wastedyears]

If you’re looking for production method, then Henry Ford is your man.

[muawiyah]

Ford didn't invent "mass production"; what he invented was the "integrated factory". His started with a steelmill and all parts (to the degree possible in that day) were manufactured on site. They ended up in the cars he produced.

However, the first "production cars", meaning you could get one after another of the same thing, were not produced that way. It was more like "just in time" production which we currently attribute (wrongly I believe) to the Japanese.

That's why I asked if anyone had found any reference to where Elwood Haynes had bought his gasoline engine for his first "model". I'm thinking it may have been bought from a factory in Indianapolis ~ Marmon-Harrington perhaps?