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  4. First patented in 1952 center pivot devices used for this agricultural task caused the green circles seen from planes

First patented in 1952 center pivot devices used for this agricultural task caused the green circles seen from planes

Since you have landed on this page then most probably you are looking for the First patented in 1952 center pivot devices used for this agricultural task caused the green circles seen from planes answer. This question was last seen on October 8 2021 Jeopardy TV Game Show.

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For more questions from this episode visit Jeopardy October 8 2021 Answers