Telephone system with selective code compression and register recycle

Claim 1

IN A TELEPHONE SWITCHING SYSTEM RESPONSIVE TO SEQUENTIALLY RECEIVED CALL DESTINATION IDENTIFYING DIGITS, WHEREIN CALLED AREAS ARE DESIGNATED BY A PLURALITY OF DIGITS PRECEDING THE EXCHANGE AND LINE IDENTIFYING DIGITS, A PLURALITY OF GROUPS OF SUBSCRIBER SENDERS, EACH SENDER HAVING INDIVIDUAL REGISTERS FOR STORING EACH DIGIT AS IT IS RECEIVED, DETECTING MEANS IN EACH SENDER OPERATIVE TO DETECT THE STORAGE AREA IDENTIFYING DIGITS THEREIN, A PLURALITY OF DECODING MEANS FOR DISTINGUISHING PRESELECTED AREA IDENTIFYING DIGITS AND RESPONSIVE THERETO TO PRODUCE OUTPUTS DISCRETELY REPRESENTATIVE THEREOF, A CONNECTOR INDIVIDUAL TO EACH GROUP OF SENDERS, FIRST PREFERENCE MEANS ACTIVATED BY SAID DETECTING MEANS FOR SELECTIVELY CONNECTING EACH SUB-