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Oct 22, 2013, 7:05 am53 ptsGrist
National Museaum of American HistorySteel moldboard plow developed by John Deere in 1838. If you have an image in your head when you think “plow,” it’s probably a moldboard plow: a deep cutting edge that swoops up and out into a curved wing, the moldboard. As the plow moves forward, it lifts the earth and…
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