What subsidiaries are there in Huabei Oilfield?

Headquarters: North China Oilfield Company, No.1 Oil Production Plant, No.2 Oil Production Plant, No.3 Oil Production Plant, No.4 Oil Production Plant, No.5 Oil Production Plant, Communication Company, Hydropower Plant, Huajia Comprehensive Service, Huasheng Comprehensive Service, Huada Comprehensive Service, Huajia Comprehensive Service, Huamei Property Service, Gorgeous Comprehensive Service, Huayuan Comprehensive Service, Huaxing Comprehensive Service, Oil Production Technology Research Institute, Design Institute, Public Utilities Office, etc. of China Petroleum and Natural Gas Company. Oh, my God, it drained my brain. That's all I know. I hope it helps you.