Abstract: The invention relates to a drill for realizing a partially tapered bore hole in a soil covering a hardpan layer. The drill comprises a rotatable drivable unit that is provided with a carrying structure and a multiple number of cutting elements carried by the carrying structure. The multiple number of cutting elements are arranged along a line extending substantially radially and outwardly from a central axis of the rotatable drivable unit. Further, lower ends of cutting elements in a radial inner section are mainly positioned in a plane transversely to the rotation axis of the rotatable drivable unit. Lower ends of cutting elements in a radial outer section are mainly positioned in a downwardly tapered surface having a symmetry axis coinciding with the rotation axis of the rotatable drivable unit. The lower ends of the cutting elements may subscribe, during rotation, a truncated cone surface.

Abstract: The invention relates to a drill for realizing a partially tapered bore hole in a soil covering a hardpan layer. The drill comprises a rotatable drivable unit that is provided with a carrying structure and a multiple number of cutting elements carried by the carrying structure. The multiple number of cutting elements are arranged along a line extending substantially radially and outwardly from a central axis of the rotatable drivable unit. Further, lower ends of cutting elements in a radial inner section are mainly positioned in a plane transversely to the rotation axis of the rotatable drivable unit. Lower ends of cutting elements in a radial outer section are mainly positioned in a downwardly tapered surface having a symmetry axis coinciding with the rotation axis of the rotatable drivable unit. The lower ends of the cutting elements may subscribe, during rotation, a truncated cone surface.

Abstract: A method for drop auction of an entity comprises providing an electronic system for auction of an entity, and allowing a selling party to enter a definition of the entity to be auctioned and a maximum asking price into the electronic system. An asking price which drops stepwise from the maximum asking price to a minimum asking price is determined. The entity is electronically offered by informing potential buyers about the current asking price. The number, the size and/or the duration of the steps by which the asking price drops is predetermined by a manager of the electronic system.

Abstract: The invention relates to a removable plant protection system, comprising a wall module including an upwardly extending wall segment that is arranged for throwing a shadow on a soil area near the wall module when the sun reaches its highest orbit point and for allowing a sun beam on the soil area at a time period on the day when the elevation of the sun is relatively low.