FIELD: medical equipment. SUBSTANCE: therapeutic prophylactic mask has fastening belt composed of two halves adapted for attachment to user's head by means of hook-and-loop fasteners. Mask has opening and projection, which are designed for putting on replaceable hollow pen made from plastic material and equipped with openings at its both sides. Pen is composed of two detachable parts and is adapted for attachment to projection. Pen contains filtering substances. EFFECT: increased efficiency and provision for expiration. 2 cl, 4 dwg _
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