The location of a wireless mobile device may be estimated using, at least in part, one or more pre-existing Network Measurement Reports which include calibration data for a number of locations within a geographic region. The system reduces the level of Sulfur Oxides and other constituents within the exhaust before the exhaust is recirculated. hexahydropseudoionone, may be prepared by hydrogenating an olefinically unsaturated ketone, e. A more efficient cooling of the spindle drive is achieved in that the cooling channels penetrate the bearing position of the spindle drive andor one of the cooling plates assigned to the bearing position.