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  • Publication Date: December 31, 1969
  • Publication Number: US-6171214-B2

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    Cited By (2)

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      US-8376912-B1February 19, 2013Ball It, Inc.Facial muscle exercise ball-like device and method
      WO-2015009641-A1January 22, 2015Raymond LongDispositif d'aide à l'inspiration profonde