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1076 fr4 cob pcb assembly products are offered for sale by suppliers on Alibaba.com, of which pcba accounts for 5%, aluminum pcb accounts for 1%. A wide variety of fr4 cob pcb assembly options are available to you, such as factory, odm.You can also choose from electronic device, oem electronic fr4 cob pcb assembly,As well as from hasl, hasl lead free fr4 cob pcb assembly,