|  | E |
SECTION E — FIXED CONSTRUCTIONS

EARTH DRILLING; MINING

|  | E21 |
EARTH DRILLING; MINING

|  | E21 |
Note(s) In this class, the term "drilling" covers "boring" and vice versa.

|  | E21B |
EARTH DRILLING, e.g. DEEP DRILLING (mining, quarrying Fulltext... Hierarchy... Expanded...E21C; making shafts, driving galleries or tunnels Fulltext... Hierarchy... Expanded...E21D); OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS FROM DEEP WELLS

|  | E21C |
MINING OR QUARRYING

|  | E21C |
Note(s) This sub-class covers methods or apparatus specific to mining or quarrying. [3] Even though disclosed only for mining or quarrying, drill bits, bore reamers, core taking devices, drilling pipes or rods, handling, racking or connecting arrangements for drilling pipes or rods, counterboring or enlarging drilled holes, flame drilling, or other drilling apparatus not provided for in this sub-class, are covered by sub-class Fulltext... Hierarchy... Expanded...E21B. [3]

|  | E21D |
SHAFTS; TUNNELS; GALLERIES (drilling or cutting machines for mining or quarrying Fulltext... Hierarchy... Expanded...E21C; safety devices, transport, rescue, ventilation or drainage Fulltext... Hierarchy... Expanded...E21F) [2]

|  | E21F |
SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINAGE IN OR OF MINES OR TUNNELS [2]