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Ditria Tries Out a Prototype Lung Exerciser (MP4 - 720p)
Ditria wants to examine a commercial "lung trainer" which consists of a strange cylindrical mouthpiece, a tube with three "bypass holes" that can be covered by the user's fingers, and a balloon. once she gets the hang of this control specimen, she tries our improved version, with a much better mouthpiece, and our standard quick-connect fitting that allows different balloons or other pressure loads to be substituted.
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