1. A CIRCUIT ARRANGEMENT FOR RESTORING CROSS-BAR TYPE SELECTOR BRIDGES IN AN AUTOMATIC TELEPHONE SYSTEM HAVING A PLURALITY OF BRIDGES, EACH HAVING A PLURALITY OF CONTACT GROUPS CONNECTING AN INPUT MEANS THERETO TO ONE OF A PLURALITY OF OUTPUT MEANS CONNECTED THERETO, THE CONTACTS OF A CONTACT GROUP WHICH HAS BEEN USED IN CONVERSATION BEING HELD IN A CLOSED POSITION BEING OPENED BY MOMENTARY OPERATION OF SAID BRIDGE TO ALLOW CLOSING OF A NEW CONTACT GROUP SELECTED, IN COMBINATION COMPRISING A MARKER CIRCUIT MEANS CONNECTABLE TO TELEPHONE LINES IN SAID SYSTEM AND RESPONSIVE TO CALLING SIGNALS THEREIN FOR IDENTIFYING A CALLING LINE AND CONNECTING IT TO A CALLED LINE THROUGH IDLE BRIDGES, A TEST WIRE CONNECTED TO EACH BRIDGE HAVING A VOLTAGE POTENTIAL DEPENDENT UPON THE IDLE AND OCCUPIED CONDITION OF SAID BRIDGES, THE CLOSED POSITION OF A PREDETERMINED CONTACT GROUP DEFINING A RESTORED NON-CONDUCTING CONDITION OF THE ASSOCATED, CONTACT MEANS RESPONSIVE TO THE CLOSED POSITION OF SAID PREDETERMINED CONTACT GROUP DEFINING A RESTORED NONCONDUCTING CONDITION FOR PROVIDING ALTERNATE CURRENT PATHS, ONE CURRENT PATH BELONGING TO EACH BRIDGE BEING IN RESTORED POSITION AND ANOTHER CURRENT PATH BELONGING TO EACH BRIDGE BEING IN A NON-RESTORED POSITION, SAID MARKER CIRCUIT MEANS INCLUDING MEANS CONNECTED TO SAID ALTERNATE CURRENT PATHS AND TO SAID TEST WIRES AND RESPONSIVE TO SAID VOLTAGE POTENTIALS FOR SENSING THE IDLE CONDITION OF SAID BRIDGES AND FOR DISTINGUISHING BETWEEN ONES OF SAID IDLE BRIDGES IN SAID RESTORED CONDITION AND ONES OF SAID IDLE BRIDGES IN AN UNRESTORED CONDITION, AND MEANS CONNECTED TO SAID SENSING AND DISTINGUISHING MEANS AND TO SAID BRIDGES FOR ENERGIZING SAID ONES OF SAID IDLE BRIDGES IN SAID UNRESTORED CONDITION TO PLACE THEM IN SAID RESTORED CONDITION.