To on all or any of the business of repairing, servicing and installation of refrigeration heating, air conditioning, mechanical ventilation, stainless steel fabrication, electrical motor rewinding and kitchen equipment’s, mechanical services (steam, compressed air water supply systems and general fabrication) fire protection systems installations, automatic sprinklers, hydrants, hose reels, foam protection spray,  deluge, carbon dioxide, plumbing, drainage and sewerage systems.