machine parts and joints 2,989 corrosion of material 1,127 preservation of material 1,127 mechanical engineering 63 machines 46 construction 17 engineering drawing 16 more ... gears 14 simulation and modelling 13 teaching aids 12 mechanisms 11 connecting parts 11 technical mechanics 11 strojní části 10 kinematics 9 classical mechanics 9 design of machines 9 valves 9 workpieces and instruments clamping 8 gear wheel 7 strojní konstrukce 7 materials 6 surface treatment of materials 6 gear drives 6 sealings 6 calculations 6 shafts 5 oscillations (physics) 5 machine tools 5 machine-tools 5 less ...