39 construction, maintenance, installation, and repair services related to pumping, pumping stations, waste water disposal instruments, and sewer systems; installation, maintenance and repair of motors and engines; installation, maintenance and repair of heating installations and air conditioning installations; installation, maintenance and repair of regulating systems, control components and auxiliary components for heating, air conditioning and water treatment systems; assembly and installation heating networks; installation of plants for the treatment or disposal of untreated waste water; and construction of basins, ponds and pits for water collection; services in the field of flood control, pressure drainage, and groundwater lowering; structural and civil engineering for the conveying of sewage and sludge; providing repair information; installation, maintenance and repair of pumps; installation, maintenance and repair of electric installations and equipment, including control and regulating installations; installation, repair and maintenance of data technology installations; plumbing; rebuilding machines that have been worn or partially destroyed; rebuilding engines that have been worn or partially destroyed; pump maintenance and repair services