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There was no one main airplane. Each country developed a number of airplanes throughout the war.
Most of the parties involved already had machine guns in their inventory prior to the outbreak of the First World War.
in world war 2
world war 1
World War I
They were introduced in 1916.
Yes, Income tax was introduced to Canada during World War 1. It was introduced to help pay for the costs of everything needed for the war.
What wartime technological developments contributed to the fighter as a military type of airplane in world war I
World War 1 introduced aerial warfare with airplanes and trench warfare
Airplane's
sonar
After the second world war.