Yantai Wanlong Vacuum Metallurgy Co., Ltd. （WLVM for short）has built the world's first batch production line of copper chromium zirconium contact line through independent research and development of core technology and independent manufacturing of core equipment. A review group composed of 15 exper

Yantai Wanlong Vacuum Metallurgy Co., Ltd. （WLVM for short）has built the world's first batch production line of copper chromium zirconium contact line through independent research and development of core technology and independent manufacturing of core equipment.A review group composed of 15 experts

Yantai Wanlong Vacuum Metallurgy Co., Ltd. （WLVM for short）has built the world's first batch production line of copper chromium zirconium contact line through independent research and development of core technology and independent manufacturing of core equipment.A review group composed of 15 experts

Yantai Wanlong Vacuum Metallurgy Co., Ltd. （WLVM for short）has built the world's first batch production line of copper chromium zirconium contact line through independent research and development of core technology and independent manufacturing of core equipment.A review group composed of 15 experts