Multek is a large PCB works affiliated to Flextronics, and United Power is the subsidiary of Unimicron, the world's largest handset PCB producer, which supplies PCB for Nokia and Motorola via Foxconn.

But it's a $250 billion industry, with just a handful of companies like Foxconn, Flextronics and Jabil Circuit manufacturing and assembling for all the global electronics brands.