I've seen mention in old tractor literature and many patents of having a PTO "independent" of the wheel drive. Most words and phrases have different meanings in different places and times. Until I see something definitive to the contrary, I'm going to assume the "live" versus "independent" versus "continuous" (and maybe a few more) were products of marketing and companies selling tractors. All wanting to sound like they had something better and different.
Emil Stumpf of Illinois got the first U.S. patent for a "continous PTO" for ag. tractors in 1940 (filed in 1942). He called it many things including "independent."
So did Henry A. Ferguson in his 1956 Patent (better know as Harry Ferguson).
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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