E21D23/087 - CPC Classification Index

ClassID:

136231 ⎘

E21D23/087 - 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; Advancing mechanisms forming parts of the roof supports acting directly on the walls of the seam

Sub-classes:

E21D23/088 » {by means of wheels, rollers, caterpillars, belts or worm screws} 2