[Class : 37] Installation, Construction, Assembly, Commissioning, Repair, Servicing, Maintenance, Upgrading, Retrofitting And Modernization Of Electrical, Electronic, Mechanical, Industrial Automation, Instrumentation, Surveillance, Telecommunication, Networking, Renewable Energy, Railway, Signaling, Communication, Fire Detection, Fire Alarm, Fire Suppression, Hvac, Security, Access Control, Solar Energy, Battery Energy Storage, Industrial Machinery, Control Panels, Electrical Distribution Systems, Smart Infrastructure And Internet Of Things (Io T) Systems; Maintenance Of Computer Hardware; Technical Support Relating To Installation And Maintenance Of The Aforesaid Systems; Infrastructure Development Services Relating To Industrial, Commercial, Governmental And Railway Projects.