The mayors of the cities of Essen and Gelsenkirchen hung up their city coats of arms right below the city border at a depth of 1,040 metres.

The connection of the Zollverein Coal Mine (Essen-Katernberg) and the Nordstern Coal Mine (Gelsenkirchen-Horst) was finally established. The mayors of the cities of Essen and Gelsenkirchen hung up their city coats of arms right below the city border at a depth of 1,040 metres.
In the picture: Horst Katzor (second from right), lord mayor of Essen; next to him on the right: his official successor Peter Reuschenbach; on the far left, next to the city coat of Gelsenkirchen: Gerhard Rehberg, mayor of Gelsenkirchen; on his right: Werner Kuhlmann, lord mayor of Gelsenkirchen.