37 Installation, repair, maintenance and servicing in relation to the following goods: compactors, liquifiers, chilling machines, cooling installations, refrigerating machines, refrigerated transport assemblies, multi-compressor refrigeration systems, airconditioning apparatus, air conditioning installations, refrigerant condensers, vaporizers, heat exchangers, heat pumps, refrigerant liquid collectors, expansion machines, current generators, parts and accessories for the aforementioned goods; consultancy and information in relation to the aforesaid services, included in this class.