| IPC 7 English version |
| Class E21 |
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| SECTION E – FIXED CONSTRUCTIONS |
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| EARTH OR ROCK DRILLING; MINING |
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| E 21 | EARTH OR ROCK DRILLING; MINING |
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| Note |
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| In this class, the following term is used with the meaning indicated: |
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| – | "drilling" covers boring and vice versa. |
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| E 21 B | EARTH OR ROCK DRILLING (mining, quarrying E21C; making shafts, driving galleries or tunnels E21D); OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS [5] |
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| E 21 C | MINING OR QUARRYING |
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| E 21 D | 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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| E 21 F | SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINAGE IN OR OF MINES OR TUNNELS [2] |
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