Transistorized timer for vehicle indicator lamps

Claim 1

A TIMER FOR THE INDICATOR LAMPS OF A DIRECTION INDICATING BLINKER OF A MOTOR VEHICLE INCLUDING: AN ASTABLE MULTIVIBRATOR COMPRISING A PAIR OF TRANSISTORS OF THE SAME CONDUCTIVITY TYPE, ONE TRANSISTOR BEING ALWAYS CONDUCTIVE AND THE OTHER CUT OFF DURING OPERATION, TWO TERMINALS ADAPTED TO BE CONNECTED TO DIFFERENTLY POLED OUTPUTS, RESPECTIVELY OF A SOURCE OF VOLTAGE SUPPLY, THE COLLECTOR AND THE EMITTER OF A FIRST TRANSISTOR EACH BEING RESPECTIVELY CONNECTED THROUGH A RESISTOR TO A DIFFERENT ONE OF SAID TERMINALS, A FIRST FEEDBACK PATH FROM THE COLLECTOR OF SAID FIRST TRANSISTOR TO THE BASE OF THE SECOND TRANSISTOR, A SECOND FEEDBACK PATH FROM THE EMITTER OF SAID FIRST TRANSISTOR TO THE BASE OF SAID SECOND TRANSISTOR, SAID FIRST FEEDBACK PATH COMPRISING AN R.C. SERIES CIRCUIT AND PROVIDING A FEEDBACK VARIABLE WITH TIME, SAID SECOND FEEDBACK PATH BEING A DIRECT CURRENT CONDUCTIVE CONNECTION INCLUDING RESISTIVE MEANS, THE COLLECTOR OF SAID SECOND TRANSSITOR BEING DIRECTLY CONNECTED TO THE BASE OF SAID FIRST TRANSISTOR AND TO THE SAME TERMINAL AS THE COLLECTOR OF SAID FIRST TRANSISTOR THROUGH A RESISTOR, THE EMITTER OF SAID SECOND TRANSISTOR BEING CONNECTED TO THE SAME TERMINAL AS THE EMITTER OF SAID FIRST TRANSISTOR, AT LEAST ONE POWER TRANSISTOR B, CIRCUIT MEANS COUPLING SAID POWER TRANSISTOR TO SAID MULTIVIBRATOR FOR DRIVING SAID POWER TRANSISTOR BY SAID MULTIVIBRATOR, MEANS FOR COUPLING AN INDICATOR LAMP TO EACH POWER TRANSISTOR, AND MEANS CONNECTING A RESISTOR IN PARALLEL WITH SAID POWER TRANSISTORS FOR PRE-HEATING SAID INDICATOR LAMPS.