The drawer contains aperture cards of GEC schedules 5A-D 50505-52889 and Associated Electrical Industries/British Thomson-Houston Co Ltd/Metropolitan-Vickers Electrical aperture cards of manufacturing drawings for traction equipment in number series: A2207550; A2208590; A2282894; B3147426; B3320341; C401382; C4134208; C4278140; D5120001; R824409; Z664312; PR–02/15; 603/16-8; 1826983 SCH; D5118600 - D5118900; D5119765 - D5120400; CTS 6013/A; TD5173000; S4 2333000 -S4 2334000; C4216814; E6075339; 282571.