what is double side printed circuit board ?the FR4 material has 2 copper trace, and also named as "Double Sided PCB" (D/S PCB), ... pcb,inside bubble all inside,cartoon,ties outside strengthening;double layer pcb boards structureTop silkscreen/LegendTop silkscreen/LegendTop Surface ... pcb manufacturer has over 10 years experience on double side pcb board fabrication,after years,now,kdpcb also built a ...