1. A SHIFT REGISTER CAPABLE OF BEING FORWARD SHIFTED AND BACKWARD SHIFTED, COMPRISING IN COMBINATION: A PLURALITY OF TUNNEL DIODE PAIRS, EACH PAIR INCLUDING TWO TUNNEL DIODES CONNECTED IN SERIES-AIDING, EACH PAIR HAVING A FIRST AND SECOND END, AND A COMMON JUNCTION POINT BETWEEN SAID TWO TUNNEL DIODES, A PLURALITY OF GROUPS OF SAID TUNNEL DIODE PAIRS, EACH COMPRISING A FIRST, A SECOND, AND A THIRD TUNNEL DIODE PAIR, A SOURCE OF THREE-PHASE FEEDING PULSES UNIFORMLY DISTRIBUTED IN RELATION TO TIME, A SOURCE OF SHIFTING PULSES, A SOURCE OF TIME-INVERTED PULSES DERIVED FROM THE THIRD PHASE OF SAID FEEDING PULSES, A SOURCE OF PULSES FOR THE CONTROL OF FORWARD SHIFTING, A SOURCE OF PULSES FOR THE CONTROL OF BACKWARD SHIFING, FIVE AND GATES, EACH HAVING TWO INPUTS AND ONE OUTPUT, A SECOND FEEDING POINT, MEANS CONNECTING THE OUTPUTS OF THE FIRST AND SECOND ONES OF SAID AND GATES TO SAID SECOND FEEDING POINT, A THIRD FEEDING POINT, MEANS CONNECTING THE OUTPUTS OF THE THIRD AND FOURTH ONES OF SAID AND GATES TO SAID THIRD FEEDING POINT, A SOURCE OF CONSTANT DIRECT CURRENT VOLTAGE, A FIRST FEEDING POINT, MEANS INCLUDING A LOAD RESISTOR CONNECTING SAID SOURCE OF DIRECT CURRENT VOLTAGE TO SAID FIRST FEEDING POINT, INTERPOSED COUPLING RESISTORS RESPECTIVELY INTERCONNECTING THE COMMON JUNCTION POINTS BETWEEN SAID PAIRS OF TUNNEL DIODES, A PLURALITY OF INPUT TERMINALS, EACH TERMINAL BEING CONNECTED TO THE COMMON JUNCTION OF THE FIRST TUNNEL DIODE PAIR OF A PARTICULAR GROUP THROUGH A RESPECTIVE INPUT RESISTOR, SAID INPUT TERMINALS BEING ADAPTED TO SERVE AS BOTH RECORDING AND READING POINTS FOR SAID SHIFT REGISTER, MEANS CONNECTING SAID FIRST END OF THE FIRST PAIR OF TUNNEL DIODES OF EACH OF SAID GROUPS TO SAID FIRST FEEDING POINT, MEANS CONNECTING SAID FIRST END OF THE SECOND PAIR OF TUNNEL DIODES OF EACH OF SAID GROUPS TO SAID SECOND FEEDING POINT, MEANS CONNECTING SAID FIRST END OF THE THIRD PAIR OF TUNNEL DIODES OF EACH OF SAID GROUPS TO SAID THIRD FEEDING POINT, MEANS CONNECTING SAID SECOND ENDS OF ALL TUNNEL DIODE PAIRS TO A POINT OF REFERENCE POTENTIAL, MEANS CONNECTED TO THE OUTPUT OF THE FIFTH ONE OF SAID AND GATES FOR CONTROLLING THE SUPPLY OF SAID CONSTANT DIRECT CURRENT VOLTAGE TO SAID FIRST FEEDING POINT, MEANS CONNECTING SAID SOURCE OF SHIFTING PULSES TO ONE OF THE INPUTS OF SAID FIFTH GATE AND CONNECTING SAID SOURCE OF TIMEINVERTED PULSES TO THE OTHER OF THE INPUTS OF SAID FIFTH GATES FOR CONTROLLING THE SUPPLYING TO ONE OF THE TWO INPUTS OF EACH OF SAID FIRST AND FOURTH AND GATES THE FIRST PHASE OF SAID THREE-PHASE FEEDING PULSES, MEANS FOR SUPPLYING TO ONE OF THE TWO INPUTS OF EACH OF SAID SECOND AND THIRD AND GATES THE SECOND PHASE OF SAID THREE-PHASE FEEDING PULSES, MEANS FOR APPLYING THE PULSES FOR CONTROL OF SAID FORWARD SHIFTING TO THE OTHER OF THE TWO INPUTS OF EACH OF SAID FIRST AND THIRD AND GATES, AND MEANS FOR APPLYING THE PULSES FOR CONTROL OF SAID BACKWARD SHIFTING TO THE OTHER OF THE TWO INPUTS OF EACH OF SAID SECOND AND FOURTH AND GATES.