ANSWERS: 1
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The hula hoop was produced by the Wham-O company which was founded by Richard K. Knerr and Arthur P. Melin. Production started in 1958, with Wham-O selling 100 million hula hoops during the first year of production.
Source:
ideafinder.com: Hula Hoop History: Invention of the Hula Hoop
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