Multi-purpose alarm system

Claim 1

AN ALARM SYSTEM COMPRISING: (A) A PLURALITY OF PARALLEL CONNECTED ALARM CIRCUITS EACH ONE OF WHICH COMPRISES: (1) A SOURCE OF ELECTRICAL DIRECT CURRENT POWER, (2) ALARM PRODUCING MEANS IN SERIES WITH NORMALLY OFF SOLID STATE SWITCHING MEANS ACROSS SAID SOURCE OF DIRECT CURRENT POWER, SAID SOLID STATE SWITCHING MEANS INCLUDING A CONTROL ELEMENT AND A CONTROLLED JUNCTION NORMALLY HELD IN A NON-CONDUCTIVE STATE AS A RESULT OF A BIAS APPLIED TO THE CONTROL ELEMENT OF SAID SOLID STATE SWITCHING MEANS, (3) CONTROL MEANS INCLUDING A PLURALITY OF NORMALLY LOW IMPEDANCE ELEMENTS IN SERIES IN THE CONTROL ELEMENT BIAS CIRCUIT OF SAID SWITCHING MEANS SO AS TO NORMALLY HOLD SAID CONTROLLED JUNCTION IN A NON-CONDUCTIVE STATE, (4) WHEREBY SAID SWITCHING MEANS IS TURNED ON WHEN THE IMPEDANNCE OF ANY ONE OF SAID IMPEDANCE ELEMENTS IN SAID CONTROL MEANS INCREASES ABOVE A PREDETERMINED VALUE; (B) SAID ALARM CIRCUITS BEING CONNECTED IN PARALLEL SO THAT WHEN ANY ONE OF SAID SOLID STATE SWITCHING MEANS CONTROLLED JUNCTION IS TURNED TO A CONDUCTIVE STATE IT CAUSES ALL THE ALARM PRODUCING MEANS TO BE ACTIVATED.