Redundant multivibrator circuit

Claim 1

IN AN APPARATUS FOR IMPROVING THE RELIABILITY OF MULTIVIBRATOR OPERATION COMPRISING, A PAIR OF BISTABLE LOAD SUPPLYING MULTIVIBRATORS HAVING INPUT AND OUTPUT TERMINALS, MEANS FOR CONCURRENTLY APPLYING TRIGGER PULSES TO CORRESPONDING INPUT TERMINALS OF SAID MULTIVIBRATORS WHEREBY AT CORRESPONDING OUTPUT TERMINALS DUPLICATE AND REDUNDANTLY AVAILABLE OUTPUT VOLTAGES ARE DEVELOPED, DETECTING MEANS FOR SENSING THE FAILURE OF EITHER OF SAID MULTIVIBRATORS TO MAINTAIN THE DISTINGUISHABLE CHARACTERISTICS OF THE VOLTAGES APPEARING AT THEIR RESPECTIVE OUTPUT TERMINALS AND DERIVING AN OUTPUT SIGNAL UPON THE OCCURRENCE OF SUCH FAILURE, A NORMALLY DE-ENERGIZED INDICATING DEVICE ENERGIZED BY THE SIGNAL OF SAID DETECTING MEANS, LOGIC CIRCUIT MEANS MONITORING THE OUTPUT VOLTAGES OF SAID MULTIVIBRATORS AND CONNECTED TO SAID DETECTING MEANS AND DURING SUCH FAILURE GENERATING A VOLTAGE IDENTIFYING WHICH OF SAID MULTIVIBRATORS REMAINS IN THE BISTABLE STATE, A LOAD CIRCUIT, PLURAL GATE MEANS INDIVIDUALLY OPERABLE TO GATE THE OUTPUT TERMINALS OF SAID MULTIVIBRATORS TO SAID LOAD CIRCUIT, AND MEANS FOR CONTROLLING THE GATES AS A FUNCTION OF THE VOLTAGE SUPPLIED BY SAID LOGIC CIRCUIT MEANS INCLUDING A THIRD MULTIVIBRATOR SET TO EITHER OF ITS BISTABLE STATES IN A MANNER TO OPERATE SAID GATE MEANS TO ESTABLISH A VOLTAGE TRANSMISSION PATH CONNECTING SAID LOAD CIRCUIT AND THE LOAD SUPPLY MULTIVIBRATOR REMAINING IN THE BISTABLE STATE.