- Vermessungsbüro RLS - Hajo Lühring ÖbVI, Jürgen Sonntag ÖbVI, Reiner Ruhmhardt ÖbVI i.R. is located in Köln, Germany on Westfeldgasse 3. - Vermessungsbüro RLS - Hajo Lühring ÖbVI, Jürgen Sonntag ÖbVI, Reiner Ruhmhardt ÖbVI i.R. is rated 4.8 out of 5 in the category land surveyor in Germany.