Control register for a multi-exchange telephone system

Claim 1

IN AN AUTOMATIC TELEPHONE SYSTEM A CIRCUIT ARRANGEMENT FOR SETTING UP A TELEPHONE CONNECTION BY MEANS OF A REGISTER FOR REGISTERING SIGNALS REPRESENTING CALLED SUBSCRIBER NUMBERS LOCATED IN A MAIN EXCHANGE BETWEEN SUBSCRIBERS BELONGING TO SUB-EXCHANGES WITHOUT A CONNECTING PATH THROUGH THE MAIN EXCHANGE, SAID CIRCUIT SYSTEM COMPRISING, IN COMBINATION, A MAIN EXCHANGE, A REGISTER IN AND MAIN EXCHANGE FOR REGISTERING SIGNALS REPRESENTING CALLED SUBSCRIBER NUMBERS A PLURALITY OF SUB-EXCHANGES, A PLURALITY OF SUBSCRIBER LINES ASSOCIATED WITH EACH SUBEXCHANGE SIGNALLING MEANS, TRUNK LINES CONNECTING EACH SUB-EXCHANGE WITH AT LEAST ANOTHER SUB-EXCHANGE AND AT LEAST ONE OF SAID SUB-EXCHANGES WITH THE MAIN EXCHANGE FOR ESTABLISHING A MULTIPLE STAGE CONNECTION BETWEEN A SUBSCRIBER BELONGING TO ANY ONE OF SAID SUB-EXCHANGES AND THE MAIN EXCHANGES, EACH OF SAID SUB-EXCHANGES INCLUDING SELECTORS AND MARKING MEANS FOR SETTING UPON CONNECTIONS BETWEEN SUBSCRIBER LINES BELONGING TO THE SAME SUB-EXCHANGE AND BETWEEN SUBSCRIBER''S LINES AND TRUNK LINES TO OTHER EXCHANGES RESPECTIVELY, MEANS IN EACH SUB-EXCHANGE FOR GENERATING SIGNALS FOR TRANSMISSION VIA A TRUNK LINE TO SAID REGISTER, SAID SIGNALS REPRESENTING THE NUMBER OF A