Lead-free HASL multilayer immersion gold rigid pcb gold-finger HASL ITEQ Planting gold finger FR4 immersion gold FR4 rigid board Carbon HASL PCB Lead-free HASL PCB Planting gold gold-finger rigid pcb immersion gold Osp immersion gold rigid board Rogers immersion silver high TG170 immersion gold immersion silver Halogen-free multilayer PCB Rogers immersion gold CEM-1 HDI

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