E21B1/04 - CPC Classification Index

ClassID:

135114 ⎘

E21B1/04 - CPC Classification

Classification description:

Percussion drilling; Surface drives for drop hammers or percussion drilling , e.g. with a cable Devices for reversing the movement of the rod or cable at the surface

Recent Application in this class:

20220152655

2022-05-19

Device for generating percussive pulses or vibrations for a construction machine

20220120167

2022-04-21

Adapters for drilled, uncompleted wells

20200332843

2020-10-22

Automatic reversing mechanism for a rock drill

20180361432

2018-12-20

Device and method for generating percussive pulses or vibrations for a construction machine

20160069135

2016-03-10

Ram boring device

20150129269

2015-05-14

IMPACT DEVICE AND METHOD OF DISMOUNTING THE SAME