How did WW1 Fighter planes fire bullets without damaging their propellers?

During WWI, airplanes were still a very new technology and people were still trying to figure out how they would work in combat.
One of the most logical steps was to add a gun to the front of a plane so it could shoot down other planes. But how to stop the gun from hitting the big propeller in the front.
Hence the sychronization gear was used.
A synchronization gear, or a gun synchronizer, sometimes rather less accurately called an interrupter, is attached to the armament of a single-engine tractor-configuration aircraft so it can fire through the arc of its spinning propeller without bullets striking the blades.

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