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How engineers invented the rubber-belted ag tractor

from Grainews

In the late 1970s, Caterpillar had been selling a limited number of SA (Special Application) crawlers to farmers. But the high-horsepower, articulated, four-wheel drive ag tractors that were pouring onto the market were eating into demand for those machines. For that and other reasons Caterpillar executives eventually decided to develop and market their own four-wheel drive ag tractor. more

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