Data switching system

Claim 1

IN A COMMUNICATION SWITCHING SYSTEM, A PLURALITY OF LINES INCLUDING A CALLING AND A CALLED LINE, A LINE CIRCUIT TERMINATING EACH SAID LINE, A FIRST SET OF TERMINALS, A SECOND SET OF TERMINALS, AND A THIRD SET OF TERMINALS, EACH SAID LINE CIRCUIT HAVING AT LEAST ONE LINE TERMINATION IN SAID FIRST AND THIRD SETS OF TERMINALS, DIGITAL TRANSMITTING MEANS AT SAID CALLING LINE, A FIRST PLURALITY OF SWITCHING STAGES ARRANGED IN TANDEM FOR SELECTIVELY ELECTRICALLY CONNECTING TERMINALS OF THE FIRT SET WITH TERMINALS OF THE SECOND SET, A SECOND SINGLE STAGE COORDINATE ARRAY OF RELAYS, ALL OF SAID STAGES COMPRISING A PLURALITY OF TWO WINDING RELAYS ARRANGED IN A COORDIANTE ARRAY, A UNIDIRECTIONAL DEVICE INDIVIDUAL TO EACH OF SAID RELAYS AND CONNECTED IN SERIES WITH A FIRST WINDING THEREOF, AT THE COORDINATE POINTS OF EACH OF SAID ARRAYS, MEANS OPERATED BY SAID CALLING LINE CIRCUIT TO APPLY A POTENTIAL TO THE FIRST WINDING OF AN ORDINATE GROUP OF RELAYS IN SAID SECOND COORDINATE ARRAY OR RELAYS, OTHER MEANS COMPRISING THE CONNECTION OF A GROUP OF SAID UNIDIRECTIONAL DEVICES TO A TERMINAL OF A SECOND SERIALLY POLED UNIDIRECTIONAL DEVICE, SAID SECOND WINDING OF EACH OF SAID RELAYS CONNECTED IN SERIES WITH A NORMALLY OPEN SET OF ITS OWN CONTACTS, LINKS INTERCONNECTING ADJACENT STAGES, A THIRD SWITCHING STAGE BETWEEN THE SECOND AND THIRS SETS OF TERMINALS, A PLURALITY OF REGISTER-SENDERS, MEANS OPERATED IN RESPONSE TO SAID POTENTIAL VIA SAID SECOND UNIDIRECTIONAL DEVICE IN SAID SECOND COORDINATE ARRAY OF RELAYS TO ALLOT AN AVAILABLE ONE OF SAID REGISTER-SENDERS, FOR SAID REGISTERSENDER TO OPERATE IN RESPONSE TO SAID ALLOTMENT TO APPLY AN OPPOSITE POTENTIAL TO SAID UNIDIRECTIONAL DEVICE TO OPERATE AN INDIVIDUAL ONE OF SAID ELAYS OF SAID SECOND COORDINATE ARAY OF RELAYS WHEREBY SAID REGISTER-SENDER IS UNIQUELY CONNECTED THROUGH SAID CALLING LINE CIRCUIT FOR OUTPULSING, MARKER MEANS CONTROLLED BY SAID REGISTERSENDER FOR APPLYING A FIRST MARKING POTENTIAL TO A SELECTED TERMINAL OF THE FIRST SET VIA SAID SECOND COORDIANTE ARRAY OF RELAYS AND A SECOND MARKING POTENTIAL TO A SELECTED TERMINAL OF THE SECOND SET WHICH PRODUCES A POTENTIAL DIFFERENCE IN THE FORWARD DIRECTION OF SAID DEVICES BETWEEN THE TWO SELECTED TERMINALS THROUGH A SERIES PATH INCLUDING THE FIRST WINDINGS OF ONE COORDINATE POINT RELAY TO EACH OF SAID STAGES AND A THIRD MARKING POTENTIAL OF THE SAME POLARITY AS THE FIRST MARKING POTENTIAL TO A SELECTED TERMINAL OF THE THIRD SET, WHICH IN CONJUNCTION WITH SAID SECOND POTENTIAL CAUSES SAID RELAYS VIA SAID FIRST WINDINGS IN THE PATH BETWEEN THE SELECTED TERMINALS TO OPERATE END THEREBY ESTABLISH A COMMUNICATION PATH, FIRST MEANS OPERATED UPON ESTABLISHMENT OF SAID COMMUNICATION PATH FOR COMPLETING A HOLDING CIRCUIT IN SERIES THROUGH THE SECOND WINDINGS AND SAID SERIES CONTACTS OF THE RELAYS IN THE ESTABLISHED PATH, OTHER MEANS EFFECTIVE SUBSEQUENT TO THE ESTABLISHMENT OF THE HOLDING PATH FOR REMOVING SAID MARKING POTENTIALS.