A printed wiring board is made of first and second substrates superimposed on each other. The first and second substrates respectively include a core layer made of resin containing carbon fibers. The second substrate has the outline different from that of the first substrate. A stepped surface is defined...http://www.google.es/patents/US7388157?utm_source=gb-gplus-sharePatente US7388157 - Printed wiring board
