Pcb design in china Key board PCB supplier china Printed circuit board manufacturer

You may have some understanding of PCB assembly Printed circuit board, but do you know some interesting things about Printed circuit board supplier? As for the first HDI pcb Printed circuit board made of brass instead of copper, do you know that this process uses a form of electroplating. Some gramophones and tube radios contain polychlorinated biphenyls, do you know? PCB has existed in the era of gramophone and vacuum tube radio, but the form is slightly different. Printed circuit board is the root of music printing industry; the US Army invented the PCB automatic assembly process.