tools:

• cad - dxf viewer:  http://www.autodesk.it/products/autocad/free-trial
  
  http://www.autodesk.it/products/autocad/free-trial - See more at: http://www.futurastampi.com/it/downloads-2#sthash.CPVsLSNX.dpuf
  http://www.autodesk.it/products/autocad/free-trial - See more at: http://www.futurastampi.com/it/downloads-2#sthash.CPVsLSNX.dpuf
• pdf viewer: http://get.adobe.com/it/reader/
  
  http://get.adobe.com/it/reader/
• edrawings: http://www.edrawingsviewer.com/ed/download.htm

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