- Qingdao Cosine Electrical Equipment Co., Ltd.
- Insulator, Composite Insulator, Porcelain Insulator, Glass Insulator, Overhead Line Fitting, Ceramic Insulator, Polymer Insulator, Pole Line Fitting, Poleline Hardware, Transmission Line Fitting
Shandong
- Beijing Red Sun Technology Co.,Ltd.
- G10, Fr4, SMC, Gpo3, FRP, GRP, Bakelite, Fr4 Tube, Phenolic Rod, PTFE
Beijing
- Shenyang Youda Trading Import & Export Co., Ltd.
- Transformer Radiator, Insulation Paper, Insulation Sheet, Electrical Insulation Paper, Insulation Films, Fish Paper, DDP Paper
Liaoning
- Yang Zhou Liu Jue Electrical Materials Co., Ltd.
- Mica Sheet; Mica Paper; Mica Tape; Epoxy Tube
Jiangsu