when was the plow created
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when was the plow created
when was the plo created
who created the plow
who created the steel plow
where and when was the steel plow created
when was the wooden plow invented
when was the metal plow invented
who invented the plow
the first plow ever made
invention of the plow
when were plows invented
when was the plow created, when was the plo created, who created the plow, who created the steel plow, where and when was the steel plow created, when was the wooden plow invented, when was the metal plow invented, who invented the plow, the first plow ever made, invention of the plow, when were plows invented