It started in the 70's with the DIYs, click the picture to view the report
  • 1970 Harak sen. - how he began
  • 1980 Stoll sen. - A master tiler saves energy
  • 1991 Daughter Harak - with styrostones - what else?
  • 1995 Daughter Stoll - with styrostones - from experience
  • 2001 Harak jun. - saves energy like his father
  • 2004 Stoll jun. - IT-entrepreneur builds smart