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RENKERT Alexander (USA) M - 2019 Trampoline Worlds, Tokyo (JPN) - Qualification Double Mini R1 - YouTube
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Keith Alexander's invention took 15 years and has made $55 million, but he doesn't own it | Stuff.co.nz
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Keith Alexander, Chris Harris, and Hamish McIntyre create the world's safest trampoline, maximizing jumping space and eliminating 90% of product-related injuries - Global Design News
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