machine parts and joints 2,913 corrosion of material 1,127 preservation of material 1,127 mechanical engineering 53 machines 38 engineering drawing 15 construction 14 more ... teaching aids 12 gears 11 connecting parts 10 technical mechanics 9 design of machines 8 mechanisms 8 gear wheel 7 strojní konstrukce 7 classical mechanics 6 gear drives 6 calculations 6 surface treatment of materials 5 strojní části 5 technical standards 5 workpieces and instruments clamping 5 valves 5 CAD 4 descriptive geometry 4 kinematics 4 materials 4 normalization 4 machine drives 4 springs (machinery) 4 less ...