This raised two questions: Why, and for how long, was wrought iron used for the moldboards of the Deere plows. [Please select]
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(It is probable that from the late 1850's on Deere plows had steel moldboards.) [Please select]
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The moldboards of practically all of his plows, from 1837 and for about 15 years, were made of wrought iron rather than steel. [Please select]
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The second and greater problem was that the richer lands of the prairie bottoms, after a few years of continuous cultivation, became so sticky that they clogged the moldboards of the plows. [Please select]
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Steel presented a smoother surface which shed the sticky loam better than the conventional wooden moldboards covered with wrought iron, or the cast iron moldboards of the newer factory-made plows then coming into use. [Please select]
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