1-A flexible electrothermal film2-Downhole pumping pipe with heating device3-oil pipeline heat exchanger4-A heating and insulating oil pipeline5-High efficiency and energy saving heat pipe6-combustible gas alarm self-closing valveElectrothermal film with high index strength of 7-far infrared ray8-electrothermal film gravure printing system-Sealing structure of 9-electrothermal film cable10-electrothermal film for reducing electromagnetic radiation11-Epoxy electrothermal Film (1)12-Epoxy Electrothermal Film (2)13-washable flexible electrothermal film14-Electrothermal film that purifies air15-electrothermal film that can improve bond strength-