TJ Mechanical engineering and machinery 662 Technology: general issues 192 History of engineering and technology 187 TA Engineering (General). Civil engineering (General) 84 History of engineering & technology 78 TK Electrical engineering. Electronics Nuclear engineering 76 Machine design and drawing 39 Research & information: general 34 Materials science 27 Mechanical engineering 25 TS Manufactures 23 Mechanical engineering & materials 21 Civil engineering, surveying & building 20 Biology, life sciences 19 Mechanics applied to machinery. Dynamics 16 Finite element method 15 Machine design 15 Technical design 15 Machine construction (General) 13 human 13 Electrical engineering 12 T Technology (General) 12 Robotics 11 TP Chemical technology 11 Engineering: general 10 Industrial chemistry and chemical engineering 10 Mechanical engineering and materials 10 Research and information: general 10 Biomechanics 9 Biotechnology 9