|  | E |
SECTION E — FIXED CONSTRUCTIONS

EARTH OR ROCK DRILLING; MINING

|  | E21 |
EARTH OR ROCK 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 OR ROCK 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 |
Note(s) This subclass covers: [7] primarily equipment for drilling of earth or rock in their natural formation; [7] similar equipment for drilling of man-made structures in situ, e.g. of road surfaces or concrete structures. [7] This subclass does not cover: [7] hand-held drilling machines, e.g. for domestic use; [7] drilling equipment for manufacturing operations, i.e. where an article is worked, e.g. for further processing; [7] which are covered by relevant subclasses of section B, e.g. Fulltext... Hierarchy... Expanded...B23B; [7] compositions for drilling of boreholes or wells or for treating boreholes or wells, which compositions are covered by group Fulltext... Hierarchy... Expanded...C09K 8/00, e.g. compositions for enhanced recovery methods for obtaining hydrocarbons Fulltext... Hierarchy... Expanded...C09K 8/58. [8] Processes using enzymes or micro-organisms in order to: [8] liberate, separate or purify a pre-existing compound or composition, or to [8] treat textiles or clean solid surfaces of materials [8] are further classified in subclass Fulltext... Hierarchy... Expanded...C12S. [8]

|  | 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 |
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; 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, 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

|  | 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