A multilayer printed circuit board included a plurality of substrates bonded together in which the surface area of each substrate is divided into equal surface areas in which each area may contain the same number and lengths of lines of conductive elements, monitor holes, plated-through holes and circuit...http://www.google.de/patents/US4799128?utm_source=gb-gplus-sharePatent US4799128 - Multilayer printed circuit board with domain partitioning
