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visual lamp indicator

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Rochester, New York. Madison E. Butler, assistant chief inspector for the Stromberg-Carlson Telephone Manufacturing Company, who developed a visual-lamp indicator to test field telephone switchboards and which the U.S. Army Signal Corps claims has saved the equivalent of almost thirty-seven years work, shown at his testing instrument. He received one of the first five "Citations of Individual Production Merit" for his idea which has an outstanding effect on the entire war effort

Rochester, New York. Madison E. Butler, assistant chief inspector for ...

Public domain photograph of the 1930s-1940s World War Two, armed forces, military production, no copyright restrictions image - Picryl description