![Jumpoline Family Fun on Twitter: "George Nissen was an American gymnast and inventor who developed the modern trampoline. #jumpoline #familyfun #colorado #aurora #trampoline https://t.co/uCVzwsnJal" / Twitter Jumpoline Family Fun on Twitter: "George Nissen was an American gymnast and inventor who developed the modern trampoline. #jumpoline #familyfun #colorado #aurora #trampoline https://t.co/uCVzwsnJal" / Twitter](https://pbs.twimg.com/media/C65OwbXWYAAhEVs.jpg)
Jumpoline Family Fun on Twitter: "George Nissen was an American gymnast and inventor who developed the modern trampoline. #jumpoline #familyfun #colorado #aurora #trampoline https://t.co/uCVzwsnJal" / Twitter
![Amazon.com: The Kid Who Invented the Trampoline: and Other Extraordinary Stories About Inventions: 9780525466543: Wulffson, Don L.: Books Amazon.com: The Kid Who Invented the Trampoline: and Other Extraordinary Stories About Inventions: 9780525466543: Wulffson, Don L.: Books](https://m.media-amazon.com/images/W/IMAGERENDERING_521856-T1/images/I/514909J301L._AC_UF1000,1000_QL80_.jpg)
Amazon.com: The Kid Who Invented the Trampoline: and Other Extraordinary Stories About Inventions: 9780525466543: Wulffson, Don L.: Books
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