The firm purchased Los Angeles-based Magnetic Signal Company in the late 1940s and moved production to Minneapolis.
Its general offices and factory were located at 3355 East Slauson Avenue in Vernon, an industrial area just south of downtown Los Angeles.
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Although it is known that the Signal Department of the Pacific Electric Railway developed the first wigwags in 1909, under the direction of Albert Hunt, it is not known at exactly what point the Magnetic Signal Company became a separate entity.
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