flutter

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References in periodicals archive ?
Exhaled air flowed out the mask through a flutter valve mounted over the nose.
As it dangles, it acts as a noisy flutter valve during relaxed breathing l Obstructed nasal airways.
Nori, an endangered manatee, is again swimming in Florida waters after a Florida park used physician Henry Heimlich's flutter valve to heal a large tear in her lung caused by a boat strike.