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USPTO has a patent on... a swing!

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http://www.freepatentsonline.com/6368227.html

*Method of swinging on a swing*

"A method of swing on a swing is disclosed, in which a user positioned on a
standard swing suspended by two chains from a substantially horizontal tree
branch induces side to side motion by pulling alternately on one chain and
then the other."

Is there a patent on a pillow already?
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