Call distributing circuit

Claim 1

IN A TELEPHONE SYSTEM, A PRIVATE BRANCH EXCHANGE, A HUNTING CONNECTOR AT SAID PRIVATE BRANCH EXCHANGE, A GROUP OF LINE TERMINALS ENGAGEABLE BY SAID HUNTING CONNECTOR, A GROUP OF EXTENSION STATIONS CONNECTED RESPECTIVELY TO SAID LINE TERMINALS, A FIRST RELAY AND A SECOND RELAY AT EACH OF SAID STATIONS, A LOCKING PATH COMMON TO ALL OF SAID FIRST RELAYS EFFECTIVE UPON OPERATION OF EACH RESPECTIVE FIRST RELAY TO HOLD THE RELAY OPERATED, MEANS EFFECTIVE IN TURN AS A RESPECTIVE STATION IS SEIZED BY SAID HUNTING CONNECTOR FOR OPERATING THE FIRST RELAY OF THAT STATION, MEANS EFFECTIVE IN TURN AS A CALL IS COMPLETED BY A RESPECTIVE STATION AND THE STATION RELEASED FOR OPERATING THE SECOND RELAY OF THE RESPECTIVE STATION, MEANS EFFECTIVE UPON OPERATION OF EACH SECOND RELAY FOR INDICATING AN ARTIFICIAL BUSY CONDITION OF THE ASSOCIATED STATION, AND MEANS EFFECTIVE UPON RELEASE OF THE LAST STATION OF THE GROUP AFTER COMPLETION OF A CALL FOR INTERRUPTING SAID LOCKING PATH AND RELEASING ALL OPERATED FIRST RELAYS WHEREBY TO REMOVE ALL ARTIFICIAL BUSY CONDITION INDICATIONS.