ATO Electric transistor wall regulator Two-tone grey openwork dial, railway hour scale and Arabic numerals, signed by the manufacturer, movement with transistor power transmission, adjustable cylindrical balance wheel, magnetic adjustment at bottom right; rectangular aluminium stand, electrical contacts for receiving clocks, four screws for levelling against the wall, Plexiglas cover After 1950 H. 47cm - W. 26 cm This regulator uses innovative technology patented by Marius Lavet and Jacques Dietsch in 1953. The current is transmitted between the coil and the transistor via a magnet. Our example has been overhauled and modified, with a battery power supply.