| 1/00 | Methods or layout of installations for water supply (E03B 3/00, E03B 9/00 take precedence) |
| 1/02 | Methods or layout of installations for water supply (E03B 3/00, E03B 9/00 take precedence) for public or like main supply |
| 1/04 | Methods or layout of installations for water supply (E03B 3/00, E03B 9/00 take precedence) for domestic or like local supply |
| 3/00 | Methods or installations for obtaining or collecting drinking water or tap water (treatment of water C02F) |
| 3/02 | Methods or installations for obtaining or collecting drinking water or tap water (treatment of water C02F) from rain-water |
| 3/03 | Methods or installations for obtaining or collecting drinking water or tap water (treatment of water C02F) from rain-water Special vessels for collecting or storing rain-water for use in the household, e.g. water-butts |
| 3/04 | Methods or installations for obtaining or collecting drinking water or tap water (treatment of water C02F) from surface water |
| 3/06 | Methods or installations for obtaining or collecting drinking water or tap water (treatment of water C02F) from underground |
| 3/08 | Methods or installations for obtaining or collecting drinking water or tap water (treatment of water C02F) from underground Obtaining and confining water by means of wells (applicable to a combination of water and other liquids or to other liquids only E21B 43/00) |
| 3/10 | Methods or installations for obtaining or collecting drinking water or tap water (treatment of water C02F) from underground Obtaining and confining water by means of wells (applicable to a combination of water and other liquids or to other liquids only E21B 43/00) by means of pit wells |
| 3/11 | Methods or installations for obtaining or collecting drinking water or tap water (treatment of water C02F) from underground Obtaining and confining water by means of wells (applicable to a combination of water and other liquids or to other liquids only E21B 43/00) by means of pit wells in combination with tubes, e.g. perforated, extending horizontally, or upwardly inclined, exterior to the pits |
| 3/12 | Methods or installations for obtaining or collecting drinking water or tap water (treatment of water C02F) from underground Obtaining and confining water by means of wells (applicable to a combination of water and other liquids or to other liquids only E21B 43/00) by means of vertical pipe wells |
| 3/14 | Methods or installations for obtaining or collecting drinking water or tap water (treatment of water C02F) from underground Obtaining and confining water by means of wells (applicable to a combination of water and other liquids or to other liquids only E21B 43/00) by means of horizontal or oblique wells |
| 3/15 | Methods or installations for obtaining or collecting drinking water or tap water (treatment of water C02F) from underground Obtaining and confining water by means of wells (applicable to a combination of water and other liquids or to other liquids only E21B 43/00) Keeping wells in good condition, e.g. by cleaning, repairing, regenerating; Maintaining or enlarging the capacity of wells or water-bearing layers (with artificial enrichment E03B 3/32) |
| 3/16 | Methods or installations for obtaining or collecting drinking water or tap water (treatment of water C02F) from underground Obtaining and confining water by means of wells (applicable to a combination of water and other liquids or to other liquids only E21B 43/00) Component parts of wells |
| 3/18 | Methods or installations for obtaining or collecting drinking water or tap water (treatment of water C02F) from underground Obtaining and confining water by means of wells (applicable to a combination of water and other liquids or to other liquids only E21B 43/00) Component parts of wells Well filters (filters in general B01D 24/00-B01D 35/00) |
| 3/20 | Methods or installations for obtaining or collecting drinking water or tap water (treatment of water C02F) from underground Obtaining and confining water by means of wells (applicable to a combination of water and other liquids or to other liquids only E21B 43/00) Component parts of wells Well filters (filters in general B01D 24/00-B01D 35/00) of elements of special shape |
| 3/22 | Methods or installations for obtaining or collecting drinking water or tap water (treatment of water C02F) from underground Obtaining and confining water by means of wells (applicable to a combination of water and other liquids or to other liquids only E21B 43/00) Component parts of wells Well filters (filters in general B01D 24/00-B01D 35/00) of elements of special shape Selection of specified materials |
| 3/24 | Methods or installations for obtaining or collecting drinking water or tap water (treatment of water C02F) from underground Obtaining and confining water by means of wells (applicable to a combination of water and other liquids or to other liquids only E21B 43/00) Component parts of wells Well filters (filters in general B01D 24/00-B01D 35/00) formed of loose materials, e.g. gravel |
| 3/26 | Methods or installations for obtaining or collecting drinking water or tap water (treatment of water C02F) from underground Obtaining and confining water by means of wells (applicable to a combination of water and other liquids or to other liquids only E21B 43/00) Component parts of wells Well filters (filters in general B01D 24/00-B01D 35/00) formed of loose materials, e.g. gravel with packed filtering material |