in response to the amplitude of the movement of the percussion tool, e.g. jump or recoil

Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions > Automatic control of the tool feed > in response to the amplitude of the movement of the percussion tool, e.g. jump or recoil

Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions > Automatic control of the tool feed ( E21B44/10 take precedence) > in response to the amplitude of the movement of the percussion tool, e.g. jump or recoil