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Smartray Protective Window Optical Window Lens Ar Coated 30mmx1.5mm for Fiber Laser Welding Head Cutting Machine, Find Details and Price about Smartray Fiber Laser Lens 4kw 27.9X4.1 22.35X Laser Protective Lens Window from Smartray Protective Window Optical Window Lens Ar Coated 30mmx1.5mm for Fiber Laser Welding Head Cutting Machine - Shanghai Shockoe Automation Technology Co., Ltd.