Print, Photographic

Sepia-toned photo of piece of equipment from Tecla Co. Inc. Pictured is a rectangular metallic object with relay switches, gauges labeled: "MAST.OSC.VAR 1," "MAST OSC. VAR 2," "OUTPUT VAR.1," and "OUTPUT VAR. 2," as well as other components labeled, "115," "102.5," "112.5," "110," "107.5," "input," and "relay." Mounted on the front is a white card with "Continuous Train Control Corporation, Clark Patents, Detroit, New York." On verso is stamped "Manning Bros. Commercial Photographers 504-505 Lincoln Building Corner State and Park Sts. Detroit, Mich." Photo is backed with canvas.