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who invented the metal plow
who invented the first plow
the invention of the steel plow
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the invention of the plow
where was the steel plow invented
what year was the steel plow invented
who created the plow
who invented the metal plow, who invented the first plow, the invention of the steel plow, who created the steel plow, the invention of the plow, where was the steel plow invented, what year was the steel plow invented, who created the plow
