| 1/00 | Sinking shafts |
| 1/02 | Sinking shafts by hand |
| 1/03 | Sinking shafts mechanically (E21D 1/08 takes precedence) |
| 1/04 | Sinking shafts mechanically (E21D 1/08 takes precedence) with grabs |
| 1/06 | Sinking shafts mechanically (E21D 1/08 takes precedence) with shaft-boring cutters (drilling machines E21B) |
| 1/08 | Sinking shafts while moving the lining downwards |
| 1/10 | Sinking shafts Preparation of the ground |
| 1/12 | Sinking shafts Preparation of the ground by freezing |
| 1/14 | Sinking shafts Preparation of the ground by freezing Freezing apparatus |
| 1/16 | Sinking shafts Preparation of the ground by petrification (grouting anchoring-bolts E21D 20/02) |
| 3/00 | Raising shafts, i.e. working upwards from the bottom |
| 5/00 | Lining shafts; Linings therefor (E21D 11/00 takes precedence) |
| 5/01 | Lining shafts; Linings therefor (E21D 11/00 takes precedence) using prefabricated lining lowered into a hole filled with liquid or viscous mass |
| 5/012 | Lining shafts; Linings therefor (E21D 11/00 takes precedence) Use of fluid-tight or anti-friction material on outside of, or between, lining layers |
| 5/016 | Lining shafts; Linings therefor (E21D 11/00 takes precedence) Bearer curbs |
| 5/02 | Lining shafts; Linings therefor (E21D 11/00 takes precedence) with wood (E21D 5/01, E21D 5/012, E21D 5/016 take precedence) |
| 5/04 | Lining shafts; Linings therefor (E21D 11/00 takes precedence) with brick, concrete, stone, or similar building materials (E21D 5/01, E21D 5/012, E21D 5/016 take precedence) |
| 5/06 | Lining shafts; Linings therefor (E21D 11/00 takes precedence) with iron or steel (E21D 5/01, E21D 5/012, E21D 5/016 take precedence) |
| 5/08 | Lining shafts; Linings therefor (E21D 11/00 takes precedence) with iron or steel (E21D 5/01, E21D 5/012, E21D 5/016 take precedence) in the form of profiled parts |
| 5/10 | Lining shafts; Linings therefor (E21D 11/00 takes precedence) with iron or steel (E21D 5/01, E21D 5/012, E21D 5/016 take precedence) in the form of tubbing |