| 1/00 | Methods, systems, or installations for draining-off sewage or storm water |
| 3/00 | Sewer pipe-line systems |
| 3/02 | Sewer pipe-line systems Arrangement of sewer pipe-lines or pipe-line systems |
| 3/04 | Sewer pipe-line systems Pipes or fittings specially adapted to sewers (manufacture of concrete tubes B28; pipes or pipe fittings in general F16L) |
| 3/06 | Sewer pipe-line systems Methods of, or installations for, laying sewer pipes (making pipes in situF16L 1/038) |
| 5/00 | Sewerage structures |
| 5/02 | Sewerage structures Manhole shafts or other inspection chambers (in general E02D 29/12); Snow-filling openings; Accessories (covers or frames for manholes or the like E02D 29/14) |
| 5/04 | Sewerage structures Gullies with or without odour seals or sediment traps |
| 5/042 | Sewerage structures Gullies with or without odour seals or sediment traps Arrangements of means against overflow of water, backing-up from the drain |
| 5/046 | Sewerage structures Gullies with or without odour seals or sediment traps adapted to be used with kerbs (E03F 5/06 takes precedence) |
| 5/06 | Sewerage structures Gullies with or without odour seals or sediment traps Gully gratings |
| 5/08 | Sewerage structures Ventilation of sewers |
| 5/10 | Sewerage structures Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins |
| 5/12 | Sewerage structures Emergency outlets |
| 5/14 | Sewerage structures Devices for separating liquid or solid substances from sewage, e.g. sand or sludge traps, rakes or grates (for use in sewage purification plants or both in sewage purification plants or in sewer systems B01D, C02F) |
| 5/16 | Sewerage structures Devices for separating liquid or solid substances from sewage, e.g. sand or sludge traps, rakes or grates (for use in sewage purification plants or both in sewage purification plants or in sewer systems B01D, C02F) Devices for separating oil, water, or grease from sewage in drains leading to the main sewer |
| 5/18 | Sewerage structures Tanks for disinfecting, neutralising, or cooling sewage (arrangements in tanks as to the biological or chemical aspect C02F) |
| 5/20 | Sewerage structures Siphon pipes or inverted siphons (for connections of baths, basins, or the like E03C 1/12) |
| 5/22 | Sewerage structures Adaptations of pumping plants for lifting sewage (wheeled apparatus for emptying sewers or cesspools E03F 7/1; pumps, pumping plants, per seF04) |
| 5/24 | Sewerage structures Installations for neutralising explosions in sewers |