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My Father, Wentworth M. Potter, invented this Emergency Signaling Mirror while working as an Illumination Engineer at the Engineering Division, Lamp Department, General Electric Company, Nela Park, Cleveland, Ohio. He wrote a paper on it that was published in Illuminating Engineering, Volume XXXIX, No. 4, April, 1944. The title of the paper is "An Emergency Signaling Mirror Incorporating High Efficiency with Precision Aiming".