Sector Icon credits
· Oil Rig, Oil Derrick, Wind Power, Airplane, Service Man, Document, Drilling, Helmet, Train, Test Tube, Oil Gauge, Excavator, Oil Factory by BomSymbols from NounProject.com
· Glass by Jino from NounProject.com
· Steel Girders by Brickclay from NounProject.com
· Tank by IYIKON from NounProject.com
. Pump by Phạm Thanh Lộc from NounProject.com