Descriptions for E21D and notes/indexes are displayed on this screen.
| E21D
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SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS (soil-conditioning or soil-stabilising materials C09K 17/00; cutting machines for mining or quarrying E21C; safety devices, transport, rescue, ventilation or drainage E21F)[2,6]
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Note(s)
This subclass covers methods or apparatus for making or lining tunnels, galleries or large underground chambers, using underground mining methods only, i.e. not involving disturbance of the ground surface [6]This subclass does not cover underground spaces made by foundation engineering, i.e. involving disturbance of the ground surface, which are covered by subclass E02D
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Subclass indexes
MAKING SHAFTS; LININGS THEREFOR | 1/00, 3/00, 7/00, 8/00; 5/00 | MAKING TUNNELS OR GALLERIES; LININGS THEREFOR | 9/00; 11/00 | MAKING UNDERGROUND CHAMBERS; LININGS THEREFOR | 13/00; 11/00 | WORKING-FACE SUPPORTS OR COVERS | 15/00, 17/00, 19/00, 21/00 | SUPPORTS FOR STEP-BY-STEP MOVEMENT | 23/00 | SETTING ANCHORING BOLTS | 20/00 |
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