Telephonic equipment monitoring system

Claim 1

IN A TELEPHONE COMMUNICATION SYSTEM HAVING AT LEAST ONE UNTENDED LOCAL STATION WHICH INCLUDES A RELAY WHICH IS ACTUATED WHEN SAID STATION IS CALLED, AND MEANS FOR TRANSMITTING AUDIBLE SIGNALS FROM SAID STATION INTO SAID TELEPHONE COMMUNICATING SYSTEM, A SYSTEM FOR MONITORING FOR NORRMALCY A MULTICIPLICITY OF PRESELECTED CONDITIONS, EACH OF WHICH HAS A DIFFERENT SELECTION POINT AND CORRESPONDING AUDIBLE IDENTIFICATION CODEFORM SIGNAL PREASSIGNED THERETO, COMPRISING, IN COMBINATION, AN AUDIBLE FREQUENCY SIGNAL GENERATOR JUXTAPOSED TO THE MEANS FOR TRANSMITTING AUDIBLE SIGNALS FROM SAID STATION; AN ELECTRICALLY OPERATED SWITCH HAVING FIRST AND SECOND TERMINALS ARRANGED TO SELECTIVELY COMPLETE AN OUTPUT CIRCUIT OF SAID AUDIBLE FREQUENCY SIGNAL GENERATOR; A MULTIPLICITY OF AUTOMATIC SWITCHES, EACH HAVING A FIRST TERMINAL AND A SECOND TERMINAL AND EACH OPERABLY RESPONSIVE TO A CONDITION TO BE MONITORED; A FIRST MULTIPOINT SELECTOR SWITCH CONNECTED TO SEQUENTIALLY COMPLETE AND INTERRUPT CIRCUITS BETWEEN THE RESPECTIVE SECOND TERMINALS OF SAID AUTOMATIC SWITCHES AND COMMON POINT ON SAID FIRST SELECTOR SWITCH; A SOURCE OF ELECTRICAL POTENTIAL CONNECTED BETWEEN THE FIRST TERMINAL OF SAID ELECTRICALLY OPERATED SWITCH AND A CONDUCTOR COMMON TO ALL FIRST TERMINALS OF SAID AUTOMATIC SWITCHES; A SECOND MULTIPOINT SELECTOR SWITCH SYNCHRONIZED WITH SAID FIRST MULTIPOINT SELECTOR SWITCH, CONNECTED TO SEQUENTIALLY COMPLETE AND INTERRUPT A CIRCUIT BETWEEN SAID COMMON POINT ON SAID FIRST SELECTOR SWITCH AND SAID SECOND TERMINAL OF SAID ELECTRICALLY OPERATED SWITCH IN ACCORDANCE WITH THE POINT POSITION OF SAID FIRST MULTIPOINT SELECTOR SWITCH AND IN ACCORDDANCE WITH SAID PREASSIGNED AUDIBLE IDENTIFICATION CODEFORM SIGNAL AND MOTIVE MEANS TO DRIVE SYNCHRONOUSLY AND CONTINUOUSLY SAID FIRST AND SAID SECOND MULTIPOINT SELECTOR SWITCHES THROUGH SUCCESSIVE SEQUENTIAL OPERATIONS, CONNECTED TO A SOURCE OF ELECTRICAL POTENTIAL THROUGH CONTACTS OF THE RELAY INCLUDED IN SAID UNTENDED LOCAL STATION.