The first shaft-drive PTO used in farm equipment that was indeed for sale to the public was demonstrated in France in 1878. This was a steam-powered live PTO. The IH thing is about mass production and tractors with serial numbers.
In the USA, George Berry invented and sold a combine with a live steam-powered PTO, in 1883.
As to Cockshut and their live PTO tractor in 1945? I'm not sure where that came from, but . . . two guys in Ohio invented the dual-clutch, live PTO for farm tractors in 1940. They described their dual-clutch setup as "independent" and "continuous." At that time, they sold the rights to Huber Mfg. What Huber did with it, I do not know.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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