BT-H Co. Ltd., Rugby - Chesterfield administrative block development plans including: 1) Proposed new administrative block scetions, elevations and detailed floor plan, scale 1/8" = 1 foot, Jan 1953 2) Layout of trunking, with floor plan, Scale: 1/3" = 1', Sep 1953; 3) Power and lighting layout, miniture bulb and tube cutting dept. (showing circuit schedules and floor plan), Scale: 1/4" = 1', Nov 1955; 4) Layout of power and lighting installation (showing systems drawings and elevations, Scale:1/8" = 1 ft, Oct 1953; 5) Lighting Trunking and Power layout, no scale, Feb 1954; 6) Emergency lighting, technical systems drawing, no scale, [1955]; 7) Modified layout of underground electrical supplies, Scale: 1/500, Jan 1954; 8) Wiring diagram for blenum fans, no scale, Jun 1954; 9) Diagram of Connections "Telereg" proportional temperature control, no scale, May 1953; 10) Key wiring diagram for Air Damper, Nov 1956; 11) Electrical layout of 1st floor (showing circuit plans and technical), no scale, Feb 1961; 12) Wiring diagram for fume cupboard in chemical laboratory, no scale, Oct 1954; 13) Wiring diagram for Gas Low Pressure Alarm System, no scale, Aug 1956; and 14) Diagram of connections condensate pumps, no scale, May 1953 1951-1961