Gas mask exhalation check valve

Abstract

1. The name of the design product: gas mask exhalation check valve. 2. The use of the design product: a functional unit for sealing the nose bridge and maintaining one-way flow of exhalation. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view 1. 5. Other circumstances that need to be explained: the content represented by the dashed line in the design product view is not claimed, and the partial protection is the gas mask exhalation check valve.

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