#21: Gas Mask
Gas masks were essential equipment for soldiers and civilians during WWII in the 1940s. You wouldn’t want to be caught without one during a gas attack. It’s estimated that millions of gas masks were produced during the war to protect people.
provided by constative.com
They were so essential during that time, that school kids even had drills where they had to bring in their masks from home and practice wearing them and hiding under the tables. It was pretty much as horrible as it sounds, but it saved people’s lives. Hopefully, we’ll never have to use them again.