TJ Mechanical engineering and machinery TS Manufactures 13 Machine design and drawing 9 VM Naval architecture. Shipbuilding. Marine engineering 9 Mechanics applied to machinery. Dynamics 8 T Technology (General) 7 TL Motor vehicles. Aeronautics. Astronautics 4 Aeronautics. Aeronautical engineering 3 Engineering machinery, tools, and implements 3 TK Electrical engineering. Electronics Nuclear engineering 3 Finite element method 2 HD28 Management. Industrial Management 2 Mechanical movements 2 QA Mathematics 2 Structural engineering 2 TD Environmental technology. Sanitary engineering 2 Airport terminals 1 Algorithms 1 Animal feeds and feed mills. Pet food industry 1 Astronautics. Space travel 1 Biotechnology 1 Carbon nanotubes. Nanoparticles. Nanostructured materials 1 Electrochemistry. Electrolysis 1 Engineering mathematics. Engineering analysis 1 Fuel 1 HE Transportation and Communications 1 Heat engines 1 Machine construction (General) 1 Machine tools and machining 1 Machinery exclusive of prime movers 1