T - Technology
T - Technology (General) TA - Engineering (General), Civil Engineering TC - Hydraulic Engineering, Ocean Engineering TD - Environmental Technology, Sanitary Engineering TE - Highway Engineering, Roads and Pavements TF - Railroad Engineering and Operation TG - Bridge Engineering TH - Building Construction TJ - Mechanical Engineering and Machinery TK - Electrical Engineering, Electronics, Nuclear Engineering TL - Motor Vehicles, Aeronautics, Astronautics TN - Mining Engineering, Metallurgy TP - Chemical Technology TR - Photography TS - Manufactures TT - Handicrafts, Arts and Crafts TX - Home Economics
