Note that that OEM would still have to deal with the minefield of patents created by the John Deere's of the world. I once worked for a company that had to work

Note that that OEM would still have to deal with the minefield of patents created by the John Deere's of the world. I once worked for a company that had to work around an electronic circuit patent to detect a pulse. That was it, that was all it did. But if you used a standard differentiator circuit to detect the pulse created by a optical sensor watching for falling seeds you would violate the patent. So a prerequisite might involve fixing the patent system...