Kopf Gruppe
Die Beobachtungstürme wurden von ZinkPower Rostock feuerverzinkt und beschichtet
http://www.zinkpower.com/en/observation-towers.html

© 2011 Kopf Gruppe
References

Observation towers

ZinkPower Rostock hot-dip galvanized and coated the 40 metre towers. They were packed for use in Indonesia ready for the journey by sea and for ease of assembly. Four containers were required for each tower.