Development tools used to machine gun armament, such as poison gas, artillery, tanks submarines, especially various types of aircraft, which led to the invention of the airplane passenger (s).
The development of tools, weapons such as artillery, machine guns, poison gas, tanks, submarines, especially aircraft types. Which led to the invention of the airplane at a later time.
The development of equipment, munitions, such as artillery, machine guns, gas tanks, submarines, especially aircraft of various types. The invention of the aircraft in a later time.