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JD Tractor HP ratings

Yesterday's Tractor Forums
The first tested over 60 was the model 80 built in 1955 and 1956.
The first tested over 70 was the Black Dash Model 820 at 72 Belt HP. Built in 1957 and 1958.

According to "Tractor Data"
Test were run 11-1-55 and 10-18-57 by University of Nebraska
 
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