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ensure that an armament attached to a single-engine aircraft could fire through the spinning arc of a propeller without damaging the propeller blades

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It was invented in Germany

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Raymond Saulnier

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it was invented regulated a machine gun's fire so as to enable the bullets to pass between the blades of the spinning propeller.

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How was it innovated and how did it change warfare?

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How was it innovated and how did it change warfare?

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It was innovate and change warfare as it took care of the problem of worrying about hurting the propeller while shooting.

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I could not find any modern uses of this invention. As planes these days do not have the problem of propellers getting in their way