Combined burglar and fire alarm device

Claim 1

AN ELECTRICAL PROTECTIVE ALARM COMPRISING A PANEL, A PLURALITY OF FIRST ELECTRICAL INDICATORS IN SERIES CONDUCTIVELY CONNECTED TO EACH OTHER AND MOUNTED ON SAID PANEL, A PLURALITY OF ELECTRICAL DETECTORS HAVING NORMALLY CLOSED CONTACTS AND BEING INSTALLED IN VARIOUS LOCATIONS TO BE PROTECTED, A FIRST PAIR OF WIRES PARALLEL CONDUCTIVELY CONNECTING EACH ONE OF SAID INDICATORS TO EACH ONE OF SAID DETECTORS, A FIRST CLOSED-CURRENT RELAY MOUNTED ON SAID PANEL AND HAVING A COIL, CONNECTING MEANS SERIALLY CONNECTING SAID COIL TO SAID INDICATORS, A FIRST ALARM CIRCUIT CONTROLLED BY A FIRST SET OF CONTACTS OF SAID FIRST RELAY AND BEING INTERRUPTED AS LONG AS SAID RELAY IS ENERGIZED, SAID CONNECTING MEANS INCLUDING A SECOND SET OF CONTACTS OF SAID FIRST RELAY, SAID SECOND SET OF CONTACTS ADAPTED TO OPEN WHEN SAID RELAY IS DEENERGIZED AT A PREDETERMINED VOLTAGE, A SECOND RELAY HAVING A COIL PARALLEL CONDUCTIVELY CONNECTED TO THE COIL OF SAID FIRST RELAY, AND A SECOND ALARM CIRCUIT CONNECTED TO SAID SECOND RELAY BEING INTERRUPTED BY THE SAME AS LONG AS THE RELAYS ARE FULLY ENERGIZED, EACH OF SAID ALARM CIRCUITS BEING CONDUCTIVELY CONNECTED TO A SEPARATE SOURCE OF ELECTRICAL CURRENT.