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Understanding PTO | What is it? How does it work? What types
Power take-off - Wikipedia
Types of Power Take-offs, Shift Types, and Engagement Methods
TractorData.com - Power Take-Off
How to choose the right power take-off for your application
Power Take-offs (PTO) Information - GlobalSpec
What is a PTO? - Muncie Power Products
Demystifying PTO Gearboxes: A Comprehensive Guide
How to Properly Spec a PTO - Parts for Trucks