in combination with tubes, e.g. perforated, extending horizontally, or upwardly inclined, exterior to the pits

Full Title

Methods or installations for obtaining or collecting drinking water or tap water > from underground > Obtaining and confining water by means of wells > by means of pit wells > in combination with tubes, e.g. perforated, extending horizontally, or upwardly inclined, exterior to the pits

Classification Context

Section:

FIXED CONSTRUCTIONS

Class:

WATER SUPPLY; SEWERAGE

Subclass:

INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER