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