Print, Photographic

Sepia-toned photo of eight Clark Train Control System units. A panel on each unit reads, "Clark Train Control System, Patented July 21, 1914 - Oct. 24, 1916, Oct. 9, 1917 - April 14, 1918, Nov. 12, 1918 - Nov. 24, 1923, July 20, 1926 - Mar. 1, 1927, March 1, 1927, Continuous Train Control Corp., Detroit, Mich." Another panel below a pair of boxes stamped with the GE logo on each unit reads, "Oscillator for Continuous Train Control," and "General Electric Co." "Tecla Company, Inc. 1507 Cass Ave. Detroit, Mich." is stamped at the lower right corner of the recto and on the verso. "Manning Bros. Commercial Photographers, [...] Lincoln Building," is stamped on the verso in faint ink. The photo is mounted on linen.