[AT] history of PTO's on tractors

[HERBERT METZ]

When did PTO's  first appear on tractors? I assume sickle bar mowers was one of the first implements that PTO's appeared on?
I use an Allis Chalmers  PTO powered four foot tiller behind my AC720 large lawn tractor; sure is a nice way to till our large vegetable garden.
Herb(GA)
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