Depends on what a person means by prototype. I may be wrong again, but this is what I think of as prototype. Sorry for the long post, when I get on a roll it is hard to stop. Experimental unit, hand built in research shop/lab, to test components for future production. Never seen by the general public, sold, or offered for sale, could be loaned to select operators for testing under actual working conditions, then returned to factory to be analized for wear & reliability, determine which parts, systems to modify, & which are to be carried over into production. A small number of units could be saved for factory archives, the rest dismantled for parts or just scrapped out.
For example, Waterloo Boy tractors. What we know as model R, started out as model R, version A, then version B, C, D...etc, each being a prototype. When they got to version R, they released it for sale as Model R. All the earlier versions were scrapped. Another example. IHC had the F-12, F-20, & F-30 in production. Prototypes based on the F-20 were known as Increased Power F-20, F-21, F-22 etc for development. These evolved into the H, the F-30 evolved into the M & so on. If you get a chance, pick up a copy of "Ford Farm Tractors", by Randy Leffingwell. You will be rolling on the floor when you see some of the prototype contraptions that Henry himself designed. Willie
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