E21D15/60 - CPC Classification Index

ClassID:

136142 ⎘

E21D15/60 - CPC Classification

Classification description:

Props ; Chocks, e.g. made of flexible containers filled with backfilling material Devices for withdrawing props or chocks

Sub-classes:

STATIC CRUSHING DIRECTIONAL ANCHOR WITHDRAWAL METHOD AT END OF LARGE-MINING-HEIGHT WORKING FACE

Base mechanism of single prop capable of being unloaded at reduced pressure

Mechanical constant-resistance single prop continuous prop lifting pre-tightening device and method

Process method for withdrawing and recovering mechanical constant-resistance single prop

Method for removing hydraulic support for solid filling coal mining