Many of these photos area available on a compact disc produced by the ICFCST Kiev Computer Museum, http://www.icfcst.kiev.ua/MUSEUM/DIFFERENT/chCD.html. Other photos - noted individually - appear courtesy of the Smithsonian National Museum of American History, Computers and Mathematics Collection.
In order to guarantee the function of the air defense system around-the-clock, two Tetivas operated simultaneously to create a failure-free computer complex. If a problem appeared in one computer, the system automatically switched to the other machine. This computer complex faithfully served the Soviet Air Defense for over thirty years and in 1987 caught Mathias Rust's flight into Soviet air space.