What were 3 new inventions that came about during World War 1?

Answer 1

the flame thrower, mustard gas and tanks were all invented during the period of ww1, the flame thrower was one of the most effective close range weapons of the time, few men survived a flame thrower attack, mustard gas was a good cover up for bigger attacks as well as the massive ratio of death caused by one mustard gas attack, tanks though slow were almost impenetrable and were a good method of safe transport as well as carrying and firing large guns which would be impossible to carry.