A method for producing printed wiring boards comprises the steps of perforating through holes at predetermined positions in an adhesive insulator sheet, filling the through holes with a conductive material such as a conductive paste or metal balls, transferring conductive wiring patterns that have been...http://www.google.com.au/patents/US6195882?utm_source=gb-gplus-sharePatent US6195882 - Method for producing printed wiring boards
