Nasal Breathing Valve, Tissot, 1904, In Use

nasal_breathing_valve_tissot_1904_in_use

A nasal breathing valve designed by Tissot.  Held in place by a headpiece.  From J. Tissot, “Nouvelle méthode de mesure et d’inscription du débit et des mouvements respiratoires de l’homme et des animaux”, Journal de physiologie et de pathologie générale, 1904, vol 6, pp. 689.

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