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On April 22, 1915, in an attempt to turn the tide in World War I, Germany unleashed 180 tons of chlorine gas on the positions of British and French troops, poisoning 5,000 allied soldiers and killing them instantly. This was the first large-scale gas war in world military history. The British and French allied forces, which suffered heavy losses after the battle, urged the local government to make anti-virus equipment as soon as possible. Soon, the two countries sent dozens of their best scientists to

Gas mask is a kind of personal special labor protection equipment, is also a soldier protective equipment, worn on the head, to protect people’s respiratory organs, eyes and face, to prevent poison gas, dust, bacteria, toxic and harmful gas or steam and other toxic substances injury of personal protection equipment. Gas mask is widely used in petroleum, chemical, mining, metallurgy, military, fire, rescue and disaster relief, health and epidemic prevention, science and technology environmental protection, machinery manufacturing and other fields, and in the haze, photochemical