Framework agreement / annual call-off contract for sewer inspection (inspection, leak test), sewer cleaning in two lots for the entire city of Gelsenkirchen over 24 months
District Central / SouthFramework agreement / annual call-off order for sewer inspection (inspection, leak test), sewer cleaning 01.01.2024-31.12.2025
District North/East/WestFramework agreement / annual call-off order for sewer inspection (inspection, leak test), sewer cleaning 01.01.2024-31.12.2025