What are some of the technological advances that came about in World War I?

Some of the technological advances made during World War 1 are: The Tank, Chemical Warfare, The use of Aircraft and High Explosive Artillary Ammunition. There was also major changes to Command and control. The smallest unit of men at the begining of the war was a company of 100 men. This started to change during world war 1 with the use of smaller 10+ men units.