Transistorized exclusive or logic circuit

Claim 1

A LOGIC CIRCUIT COMPRISING: FIRST AND SECOND TRANSISTORS EACH HAVING BASE, EMITTER AND COLLECTOR ELECTRODES; FIRST AND SECOND INPUT TERMINALS TO WHICH RESPECTIVE SOURCES OF INPUT VOLTAGE LEVELS ARE ADAPTED TO BE APPLIED; FIRST AND SECOND DIODES; A FIRST RESISTOR; SAID FIRST DIODE BEING CONNECTED BETWEEN SAID FIRST INPUT TERMINAL AND SAID FIRST RESISTOR; SAID SECOND DIODE BEING CONNECTED BETWEEN SAID SECOND INPUT TERMINAL AND SAID FIRST RESISTOR; A SECOND RESISTOR; MEANS CONNECTING SAID FIRST AND SECOND RESISTORS IN SERIES TO THE BASE ELECTRODE OF SAID FIRST TRANSISTOR; THIRD AND FOURTH DIODES; SAID THIRD AND FOURTH DIODES BEING RESPECTIVELY CONNECTED BETWEEN SAID FIRST AND SECOND INPUT TERMINALS AND ONE TERMINAL OF A THIRD RESISTOR, MEANS CONNECTING THE OTHER TERMINAL OF SAID THIRD RESISTOR TO THE BASE ELECTRODE OF SAID SECOND TRANSISTOR; A FIRST SOURCE OF POTENTIAL CONNECTED TO THE JUNCTION OF SAID THIRD AND FOURTH DIODES AND SAID THIRD RESISTOR; A SECOND SOURCE OF POTENTIAL OPPOSITE IN POLARITY TO SAID FIRST SOURCE OF POTENTIAL CONNECTED TO THE BASE OF SAID SECOND TRANSISTOR; FURTHER MEANS CONNECTING THE BASE ELECTRODE OF SAID FIRST TRANSISTOR TO SAID SECOND SOURCE OF POTENTIAL; A POINT OF REFERENCE POTENTIAL; MEANS DIRECTLY CONNECTING THE EMITTER ELECTRODES OF SAID FIRST AND SECOND TRANSISTORS TO SAID POINT OF REFERENCE POTENTIAL; MEANS DIRECTLY CONNECTING THE COLLECTOR ELECTRODE OF SAID SECOND TRANSISTOR TO THE JUNCTION BETWEEN SAID FIRST AND SECOND RESISTORS; A THIRD SOURCE OF POTENTIAL CONNECTED TO THE COLLECTOR ELECTRODE OF SAID FIRST TRANSISTOR; AND AN OUTPUT TERMINAL CONNECTED TO THE COLLECTOR ELECTRODE OF SAID FIRST TRANSISTOR.