Guidance: Wire guided MCLOS, using a thumb joystick and visual observation of two flares on the wings. Number built: 1,000 See also Humber Hornet Ruhrstahl X-4 References Sources War Machine encyclopedia, Aerospace Publishing Ltd., pag. 253 (in Italian version printed by De Agostini, 1984). Rockets and Missiles - John W. R. Taylor - Hippo Books No 8 - Hamlyn, 1971 - Anti-tank guided missiles of Australia Anti-tank guided missiles of the United Kingdom Anti-tank guided missiles of the Cold War Military equipment introduced in the 1950s