Barr & Stroud. Data sheet, Passive night telescopes CU17 and CU18 Barr & Stroud. Calcium aluminium glasses, For infra red optics G.E.C. High intensity runway light G.E.C. Low intensity appraoch light Vickers-Armstrongs 75 m.m. Field Artillery Equipment Scientific handicraft : an illustrated and descriptive catalogue of scientific apparatus manufactured and sold by John J. Griffin & Sons, makers of scientific instruments léger char blindé Garden-Loyd M. VI ATM. Street fire alarm and ambulance systems. ATM. Electro-matic vehical actuated signals, pneumatic type detector ATM. Strowger, Ten-line private automatic telephone exchange equipment ATM. Strowger 25-line private automatic telephone exchange equipment ATM. Rythmatic control, Type 45 equipment for l.t. substation areas, engeneering bulletin 2191