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1. The history of tractors ______back to the invention of the first tractor in 1868.
2. These original tractors were not the more compact models we _______today at all.
3. John Froehlich of South Dakota successfully ________a gasoline powered tractor to power his threshing machine during his 1892 harvest.
4. Ford did not ________his tractor a tractor, however. In inimitable Ford style, his was an automobile plow.
5. Tractors could _________harder and didn't need to rest.