Arms Trivia:What is the button on the gas mask?

There is a pull button on the household gas mask, not to prevent smoke from coming in from the neck. It is to prevent being robbed in the fire. In the same way, if there is a problem with the companion's respirator during diving, it is not possible to go forward for the first time because it is possible to get rid of the mask. Human sex evil?

Definition of a gas mask

Gas mask is a personal special labor protection product, also a personal protective equipment, worn on the head, protecting people's respiratory organs, eyes and face, to prevent toxic substances such as poisonous gas, dust, bacteria, toxic and harmful gases or steam. Personal protective equipment. Gas masks are widely used in petroleum, chemical, mining, metallurgy, military, fire, disaster relief, sanitation and epidemic prevention, science and technology, environmental protection, machinery manufacturing, etc., as well as more important individuals in cities with more smog and photochemical smog. Respiratory protection. The gas mask can be divided into a full-featured and a half-mask from the shape, and is fully divided into a positive pressure type and a negative pressure type.