A time switch with a dual structure-type control memory utilizing a time division time switch. The switch is equipped with a speech memory unit into which digital signals to be interchanged are temporarily written, and a control memory unit into which addresses to be accessed by the speech memory unit...http://www.google.fr/patents/US4759010?utm_source=gb-gplus-shareBrevet US4759010 - Time switch with a dual memory structure-type control memory
Time switch with a dual memory structure-type control memory
