|  | E |
SECTION E — FIXED CONSTRUCTIONS

EARTH DRILLING; MINING

|  | E21 |
EARTH DRILLING; MINING

|  | E21 |
Note(s) In this class, the following term is used with the meaning indicated: "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 OR A SLURRY OF MINERALS FROM WELLS [5]

|  | E21B |
Subclass index
METHODS OR APPARATUS FOR DRILLING | 1/00 - 7/00
DRILLING TOOLS; ACCESSORIES THEREFOR | 10/00, 11/00; 12/00
OTHER EQUIPMENT OR DETAILS FOR DRILLING; WELL EQUIPMENT OR MAINTENANCE |
Derricks; drilling rods or the like | 15/00; 17/00, 19/00
Flushing or cleaning; sealing; heating or cooling | 21/00, 37/00; 33/00; 36/00
Valve arrangements; fire-fighting | 34/00; 35/00
Other equipment or details | 23/00 - 31/00, 40/00, 41/00
OBTAINING FLUIDS FROM WELLS | 43/00
CONTROL; SURVEYING OR TESTING | 44/00; 45/00 - 49/00

|  | E21C |
MINING OR QUARRYING

|  | E21C |
Note(s) This subclass covers methods or apparatus specific to mining or quarrying. [3] This subclass does not cover, even though they may be 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, which are covered by subclass Fulltext... Hierarchy... Expanded...E21B. [3]

|  | E21C |
Subclass index
CUTTING; SLITTING; DISLODGING |
General structure of machines | 25/00, 27/00
Details | 29/00, 31/00, 35/00
Other devices | 33/00, 37/00, 39/00
METHODS OF MINING OR QUARRYING; OPEN-PIT MINING | 41/00, 45/00; 47/00, 49/00
OBTAINING MINERALS FROM UNDERWATER | 50/00
WINNING MATERIALS FROM EXTRATERRESTRIAL SOURCES | 51/00

|  | E21D |
SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS (soil conditioning or soil stabilising materials Fulltext... Hierarchy... Expanded...C09K 17/00; drilling or cutting machines for mining or quarrying Fulltext... Hierarchy... Expanded...E21C; safety devices, transport, rescue, ventilation or drainage Fulltext... Hierarchy... Expanded...E21F) [2,6]

|  | E21D |
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 Fulltext... Hierarchy... Expanded...E02D. [6]

|  | E21D |
Subclass index
MAKING SHAFTS; LININGS THEREFOR | 1/00, 3/00, 7/00; 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

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

|  | E21F |
Subclass index
VENTILATION | 1/00, 3/00
DRAINAGE | 16/00
SAFETY DEVICES, RESCUE DEVICES | 5/00 - 11/00
TRANSPORT; FILLING-UP | 13/00; 15/00
OTHER METHODS OR DEVICES | 17/00