| 1/00 | Percussion drilling (drives used in the borehole E21B 4/00) |
| 1/02 | Percussion drilling (drives used in the borehole E21B 4/00) Surface drives for drop hammers, e.g. with a cable |
| 1/04 | Percussion drilling (drives used in the borehole E21B 4/00) Surface drives for drop hammers, e.g. with a cable Devices for reversing the movement of the rod or cable at the surface |
| 1/12 | Percussion drilling (drives used in the borehole E21B 4/00) with a reciprocating impulse member (E21B 1/02, E21B 1/38 take precedence) |
| 1/14 | Percussion drilling (drives used in the borehole E21B 4/00) with a reciprocating impulse member (E21B 1/02, E21B 1/38 take precedence) driven by a rotating mechanism |
| 1/16 | Percussion drilling (drives used in the borehole E21B 4/00) with a reciprocating impulse member (E21B 1/02, E21B 1/38 take precedence) driven by a rotating mechanism with spring-mounted reciprocating masses, e.g. with air cushion |
| 1/18 | Percussion drilling (drives used in the borehole E21B 4/00) with a reciprocating impulse member (E21B 1/02, E21B 1/38 take precedence) driven by a rotating mechanism with spring-mounted reciprocating masses, e.g. with air cushion with elastic joining of the drive to the push-rod by double buffer springs |
| 1/20 | Percussion drilling (drives used in the borehole E21B 4/00) with a reciprocating impulse member (E21B 1/02, E21B 1/38 take precedence) driven by a rotating mechanism formed as centrifugal hammers |
| 1/22 | Percussion drilling (drives used in the borehole E21B 4/00) with a reciprocating impulse member (E21B 1/02, E21B 1/38 take precedence) driven by electromagnets |
| 1/24 | Percussion drilling (drives used in the borehole E21B 4/00) with a reciprocating impulse member (E21B 1/02, E21B 1/38 take precedence) the impulse member being a piston driven directly by fluid pressure |
| 1/26 | Percussion drilling (drives used in the borehole E21B 4/00) with a reciprocating impulse member (E21B 1/02, E21B 1/38 take precedence) the impulse member being a piston driven directly by fluid pressure by liquid pressure |
| 1/28 | Percussion drilling (drives used in the borehole E21B 4/00) with a reciprocating impulse member (E21B 1/02, E21B 1/38 take precedence) the impulse member being a piston driven directly by fluid pressure by liquid pressure working with pulses |
| 1/30 | Percussion drilling (drives used in the borehole E21B 4/00) with a reciprocating impulse member (E21B 1/02, E21B 1/38 take precedence) the impulse member being a piston driven directly by fluid pressure by air, steam or gas pressure |
| 1/32 | Percussion drilling (drives used in the borehole E21B 4/00) with a reciprocating impulse member (E21B 1/02, E21B 1/38 take precedence) the impulse member being a piston driven directly by fluid pressure by air, steam or gas pressure working with pulses |
| 1/34 | Percussion drilling (drives used in the borehole E21B 4/00) with a reciprocating impulse member (E21B 1/02, E21B 1/38 take precedence) the impulse member being a piston driven directly by fluid pressure by air, steam or gas pressure working with pulses the impulse member being a piston of an internal-combustion engine |
| 1/36 | Percussion drilling (drives used in the borehole E21B 4/00) Tool-carrier piston type, i.e. in which the tool is connected to an impulse member |
| 1/38 | Percussion drilling (drives used in the borehole E21B 4/00) Hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member |
| 3/00 | Rotary drilling (drives used in the borehole E21B 4/00; rotary drilling machines in general B23B) |
| 3/02 | Rotary drilling (drives used in the borehole E21B 4/00; rotary drilling machines in general B23B) Surface drives for rotary drilling |
| 3/025 | Rotary drilling (drives used in the borehole E21B 4/00; rotary drilling machines in general B23B) Surface drives for rotary drilling with a to-and-fro rotation of the tool |