Burglar alarm system

Claim 1

AN ALARM SYSTEM FOR PROVIDING MUTUAL WARNING AT PLURAL STATIONS OF SAID SYSTEM OF INTRUSION UPON ANY ONE OF SAID PLURAL STATIONS WHICH COMPRISES, A LIKE PLURALITY OF LIKE ALARM ARRANGEMENTS DISPOSED, RESPECTIVELY, AT EACH OF SAID STATIONS, EACH ONE OF SAID ARRANGEMENTS COMPRISING A TRANSFORMER HAVING INPUT LEADS ADAPTED FOR CONNECTION TO A SOURCE OF ALTERNATING CURRENT, SAID TRANSFORMER HAVING A SECONDARY WINDING HAVING FIRST AND SECOND PARTS CONNECTED IN SERIES, A FIRST LEAD CONNECTED TO A COMMON CONNECTION POINT IN SAID TRANSFORMER SECONDARY WINDING BETWEEN SAID PARTS, A SECOND LEAD CONNECTED TO ONE EXTERIOR TERMINAL OF SAID SECONDARY WINDING AND A THIRD LEAD CONNECTED TO THE REMAINING TERMINAL OF SAID SECONDARY WINDING, A FOURTH, ALARM LEAD, A PLURALITY OF PARALLEL CONNECTED, NORMALLY OPEN SWITCHES DISPOSABLE ABOUT THE STATION ASSOCIATED WITH SAID ONE ARRANGEMENT, THE SWITCHES OF SAID LAST NAMED PLURALITY BEING OPERABLE TO A CLOSED CONDITION UPON INTRUSION AT AN ASSOCIATED LOCATION IN THE ASSOCIATED STATION, SAID PARALLEL CONNECTED SWITCHES BEING CONNECTED BETWEEN SAID SECOND AND FOURTH LEADS, FOR CONNECTING SAID SECOND LEAD WITH SAID FOURTH LEAD, ANOTHER PLURALITY OF TWO CONDUCTIVE PATHS SWITCHES HAVING ONE NORMALLY OPEN PATH AND ONE NORMALLY CLOSED PATH, THE SWITCHES OF SAID LAST NAMED PLURALITY CORRESPONDING IN NUMBER WITH THE NUMBER OF SAID PLURAL STATIONS, BOTH PATHS OF EACH SWITCH BEING CONNECTED IN SERIES WITH AN OPERATING WINDING, EACH OF SAID SWITCHES FURTHER COMPRISING AN OPERATING LINKAGE RESPONSIVE TO CURRENT FLOW IN SAID WINDING, EACH OF SAID NORMALLY CLOSED PATHS BEING RESPECTIVELY CONNECTED WITH AN ALARM LEAD AT A DIFFERENT ONE OF SAID STATIONS AND EACH OF SAID NORMALLY OPEN PATHS BEING CONNECTED TO SAID SECOND LEAD, A LIKE PLURALITY OF ELECTRICALLY OPERATED INDICATING DEVICES EACH PAIRED WITH A NORMALLY OPEN SWITCH, ELECTROMAGNETICALLY OPERATIVE TO A CLOSED CONDITION, SAID DEVICES AND SWITCHES BEING CONNECTED ACROSS SAID FIRST AND THIRD LEADS, THE LINKAGES OF SAID PLURALITY BEING OPERATIVE TO SHUT A RESPECTIVELY ASSOCIATED ONE, OF SAID LAST NAMED SWITCHES AND TO SHIFT CONDUCTION STATES OF TWO PATHS IN AN ASSOCIATED ONE OF SAID PARALLEL CONNECTED PATHS UPON ENERGIZING OF SAID WINDING, WHEREBY A DISTINCTIVE ONE OF SAID INDICATING DEVICES IS ENERGIZED AND HELD ENERGIZED BY CURRENT FROM SAID SECOND LEAD UPON CLOSURE OF ONE OF SAID PLURALITY OF PARALLEL CONNECTED SWITCHES AT ONE OF SAID PLURAL STATIONS.