A multilayered printed wiring board (PWB) with improved probing for in-circuit, functional, and prototype testing. The PWB includes a support layer and at least a top layer disposed over the support layer. The top layer has one or more circuits with traces for measuring signals produced by the circuit....http://www.google.com.au/patents/US6103978?utm_source=gb-gplus-sharePatent US6103978 - Printed wiring board having inner test-layer for improved test probing
