- 71.12 — Activities in the field of engineering, geology and geodesy, provision of technical advice in these areas
- 25.29 — Manufacture of metal tanks, reservoirs and containers
- 25.99 — Manufacture of fabricated metal products, n.v.d.g.
- 43.22 — Installation water supply systems, heating and air conditioning
- 46.90 — Non-specialized wholesale trade
- 72.19 — Research and experimental development in other natural sciences and engineering
- 74.90 — Other professional, scientific and technical activities, n.v.d.g.
Engineering, purification of industrial waste water, equipment for purification facilities