37 Installation, cleaning, repair and maintenance work relating to extraction machines for industrial purposes, blowers for compressing, drawing in and transporting gases, blower machines, compressors [superchargers], compressors [machines], superchargers [turbochargers], air filters for engines, air condensers, installation, cleaning, repair and maintenance services relating to fans for engines, compressors, blowers and blowers, in particular for use in plant construction, electric generators machines and machine tools for material processing and production, motors, drives and controls for the operation of machines and engines; rental, hiring and leasing of goods in connection with the provision of the aforesaid services, included in this class; consultancy and information relating to the aforesaid services, included in this class