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How the Trampoline Came to Be | Smithsonian
George Nissen - Wikipedia
Trampoline - The Strong National Museum of Play
The Olympic trampoline tradition: Remembering the man who …
George Nissen - Lemelson
George Nissen, Father of the Trampoline, Dies at 96
George Nissen and the Trampoline – Lichtenberger Engineering …
Who Made That Trampoline? - The New York Times
Nissen, George - USA Gymnastics
When an Invention Reached New Heights - The New York Times