Disclosed is a duplex system having a function to suppress radio wave radiation. To suppress unnecessary radiation of radio waves from duplex clock signal lines, the system comprises a plurality of cards each for mounting electronic devices, a backboard for supporting the plurality of cards to be standing...http://www.google.se/patents/US5057708?utm_source=gb-gplus-sharePatent US5057708 - Duplex system having a function to suppress radio wave radiation
