late 1940s. At that time, the offices and factory on Slauson Avenue were closed down and relocated to Minneapolis. The Magnetic Signal Company was sold to the Griswold Signal Company of Minneapolis shortly after WWII. Production of new signals continued until 1949, and replacement parts until 1960. Bibliography The Life and Times of the Pacific Electric: The World's Greatest Interurban'', by Jim Walker, published by the Orange Empire Railway Museum of Perris, California (1983) References External links 1922 Magnetic Signal Co. Catalog Magnetic Signal Company catalog on Trainweb.org Railway signalling manufacturers Defunct manufacturing companies based in Greater Los Angeles