A canvas mask has glass lenses to see through and attached tubing near the mouth area.

What new technology during World War I led to the development of the piece of equipment shown here?

A.
the machine gun

B.
poison gas

C.
submarines

D.
nuclear weapons

A canvas mask has glass lenses to see through and attached tubing near the mouth area What new technology during World War I led to the development of the piec class=