You'd have to define "truly independent" to attempt to answer. The Cockshut PTO had to rely on the tractor engine for power, so it's not really "independent" by the common use of the word.
George Berry built combines in 1883 (in California) that used one common steam boiler, one large steam engine for wheel drive, and one small steam engine for the "independent" PTO. There were similar versions in France also in the 1800s. I suspect, going by your use of the phrase, they were just as "independent" as the design used in the Cockshut. The use of the word "independent power shaft" showed up in early farm tractor patents for many PTOs, as long at they could be run "independent" of the wheel drive. Use of the word did not just apply to the type you mention.
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