We visited the Wheeler Maple Products (located slightly south of the middle of Nowhere, Ontario) on the weekend. Certainly a backwoods business done right. Pancakes and sausages were great but part of the attraction is the forest-farm (chainsaw) museum. Lots of old mechanical things to admire and ponder.
This device is a whole ungainly saw system that would attach to the back end of a tractor. The pump would be run by the PTO, tank hung wherever was convenient and any log within 10 or 15 feet could be cut. Setup time would suggest it would not be for casual use, but if you were the kinda guy that hated pulling starter cords... Made by the Von Ruden Manufacturing company in Claremont, Minnesota, which is still in business today, located in Buffalo. Another one here.