Installation, maintenance, repair, servicing, restoration and overhaul of high pressure air generators, [pneumatic actuators, air condensers, air suction machines,] condensing installations, condensers, compressed air machines, air compressors, gas compressors, gas generators, filters for compressors and high-pressure air generators, filtering machines for compressors and high pressure air generators, separators for the cleaning and purification of gases, refrigeration and cooling apparatus, [refrigerators, air conditioners,] gas liquefying apparatus for the supply of high pressure pure air, gas purifying apparatus for the supply of high-pressure pure air, drying apparatus for the ejection of weapons, air cooling apparatus, [regulating and safety accessories for gas apparatus;] information and advisory services, namely, providing information and advisory services relating to the installation, maintenance, repair, servicing, restoration and overhaul of all the aforementioned goods in person, by mail, telephone or global network electronic mail; consultancy services relating to the installation, maintenance, repair, servicing, restoration and overhaul of all of the aforementioned goods in person, by mail, telephone or global network electronic mail