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who invented the metal plow
when was the first plow invented
around what time was the plow invented
who invented the steel plow
who invented the steel plow in 1837
the invention of the steel plow
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invention of the plow
steel plow invention year
who invented the metal plow, when was the first plow invented, around what time was the plow invented, who invented the steel plow, who invented the steel plow in 1837, the invention of the steel plow, who invented the plow, invention of the plow, steel plow invention year
