Industrial production - homework
https://www.youtube.com/watch?v=UGKU9ZhyjkI
http://en.wikipedia.org/wiki/Mechanical_engineering
http://en.wikipedia.org/wiki/Fabrication_of_structural_steel_by_plasma_and_laser_cutting
http://www.nuermont.de/e-mechanical-manufacturing-structural-metal-steel-engineering-sheet-metal.htm
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