TJ Mechanical engineering and machinery 417 Mechanics applied to machinery. Dynamics 43 Machine design and drawing 39 Machine construction (General) 23 Mechanical and electrical engineering combined 14 Aeronautics. Aeronautical engineering 12 Engineering machinery, tools, and implements 12 Mechanical movements 12 Finite element method 11 Materials of engineering and construction 11 Engineering mathematics. Engineering analysis 9 Heat engines 9 Composite materials 7 Engineering geology. Rock mechanics. Soil mechanics 7 Miscellaneous motors and engines.Including gas, gasoline, diesel engines 7 Power resources 7 Biotechnology 6 Mechanics of engineering. Applied mechanics 6 Metal manufactures. Metalworking 6 Algorithms 4 Biodiesel fuels 4 Control engineering systems. Automatic machinery (General) 4 Energy conservation 4 Engineered wood. Fiberboard, particle board, etc 4 Heat. Heat in its applications, as a source of power, etc 4 Hydraulic machinery 4 Machinery exclusive of prime movers 4 Mechanics of flight: Aerodynamics 4 Product engineering 4 Structural engineering 4