Free running multivibrator circuit energizing an indicator circuit

Claim 1

IN AN ELECTRICAL SYSTEM FOR ALTERNATELY ENERGIZING AND DE-ENERGIZING AN OUTPUT INDICATOR, THE COMBINATION COMPRISING AN INPUT DIRECT CURRENT POTENTIAL APPLIED TO A PAIR OF INPUT LINES, A PAIR OF JUNCTION TRANSISTORS HAVING BASE, EMITTER AND COLLECTOR ELECTRODES, MEANS CONNECTING THE EMITTER-COLLECTOR CIRCUITS OF SAID TRANSISTORS ACROSS SAID INPUT LINES, FAULT SWITCH MEANS CONNECTED TO SAID INPUT LINES TO PROVIDE POWER AT A PREDETERMINED TIME TO SAID TRANSISTORS, A WINDING OF AN OUTPUT RELAY CONNECTED IN THE EMITTER-COLLECTOR CIRCUIT OF ONE OF SAID TRANSISTORS, AN ISOLATING DIODE POLED IN A FORWARD CONDUCTION DIRECTION INCLUDED IN SAID EMITTER-COLLECTOR CIRCUIT OF THE TRANSISTOR DRIVING SAID INPUT RELAY WINDING, SAID DIODE PERMITTING CONDUCTION THERETHROUGH ONLY WHEN ITS ASSOCIATED TRANSISTOR CONDUCTS, OUTPUT INDICATING MEANS CONTROLLED BY CONTACTS OF SAID OUTPUT RELAY, CAPACITOR MEANS CROSS-CONNECTED FROM EACH COLLECTOR ELECTRODE TO THE BASE ELECTRODE OF THE OPPOSITE OF SAID TRANSISTORS, A PLURALITY OF RESISTORS