TJ Mechanical engineering and machinery 124 TA Engineering (General). Civil engineering (General) 66 QC Physics 54 TK Electrical engineering. Electronics Nuclear engineering 29 T Technology (General) 22 TP Chemical technology 16 QD Chemistry 13 Q Science (General) 9 QA Mathematics 8 TL Motor vehicles. Aeronautics. Astronautics 5 Mechanics applied to machinery. Dynamics 4 Dynamic loading conditions. Structural dynamics. Vibrations 3 Finite element method 3 HE Transportation and Communications 3 TS Manufactures 3 Vibration 3 Aorta 2 Engineering 2 Foot 2 Gout 2 Knee 2 Machine construction (General) 2 Machinery exclusive of prime movers 2 Mechanical devices and figures. Automata. Ingenious mechanisms.Robots (General) 2 Q Science 2 QA75 Electronic computers. Computer science 2 QH301 Biology 2 Structural engineering 2 TA Engineering. Civil engineering 2 TH Building construction 2