E21D23/0073 - CPC Classification Index

ClassID:

136204 ⎘

E21D23/0073 - CPC Classification

Classification description:

Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices with advancing shifting devices connected therewith

Recent Application in this class:

20210270134

2021-09-02

CONSTRUCTION METHOD FOR CONTINUOUS MINING MACHINE HAVING DEVICE CONTINUOUSLY PROVIDING PROVISIONAL ROOF SUPPORT

20200049006

2020-02-13

Self-advancing roof support for a longwall mining system

20160230554

2016-08-11

Advancing ram pin retention device