Origins of the tree swing pictures | Hacker News

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		Origins of the tree swing pictures (businessballs.com)
		2 points by efraim on March 15, 2013 \| hide \| past \| favorite \| 1 comment

zw123456 on March 15, 2013 [–]

Those never fail to crack me up,My question is, has anyone patented any of those designs.:)

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