E21D - CPC Classification
Classification description:
Sub-classes:
- E21D1/00 » Shafts 10
- E21D1/00 » Shafts 10
- E21D1/00 » Sinking shafts 10
- E21D1/00 » Sinking shafts 10
- E21D11/00 » Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling 31
- E21D13/00 » Large underground chambers; Methods or apparatus for making them 31
- E21D15/00 » Working-face supports 9
- E21D15/00 » Working-face supports 9
- E21D15/00 » Props ; Chocks, {e.g. made of flexible containers filled with backfilling material} 9
- E21D15/00 » Props ; Chocks, {e.g. made of flexible containers filled with backfilling material} 9
- E21D17/00 » Caps for supporting mine roofs 4
- E21D19/00 » Provisional protective covers for working space 9
- E21D20/00 » Setting anchoring-bolts 63
- E21D21/00 » Anchoring-bolts for roof, floor {in galleries or longwall working} , or shaft-lining protection 31
- E21D23/00 » Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyers, mining machines, or guides therefor 4
- E21D3/00 » Raising shafts, i.e. working upwards from the bottom 5
- E21D5/00 » Lining shafts; Linings therefor 10
- E21D7/00 » Shaft equipment, e.g. timbering within the shaft 7
- E21D8/00 » Shafts not provided for in groups to 0
- E21D9/00 » Tunnels; Galleries; Large underground chambers; Linings therefor 11
- E21D9/00 » Tunnels; Galleries; Large underground chambers; Linings therefor 11
- E21D9/00 » Tunnels or galleries, with or without linings; Methods or apparatus for making thereof ; Layout of tunnels or galleries 11
- E21D9/00 » Tunnels or galleries, with or without linings; Methods or apparatus for making thereof ; Layout of tunnels or galleries 11
