Selective position controller circuit

Claim 1

IN A SELECTIVE POSITION CONTROL SYSTEM OF THE TYPE HAVING A REVERSIBLE MOTOR WHOSE SHAFT IS COUPLED TO AND POSITIONS AN ELEMENT BY ITS ANGULAR DISPLACEMENT THAT CIRCUIT WHICH COMPRISES A PLURALITY OF POTENTIOMETERS EACH HAVING A SLIDABLE CONTACT ARM, A VOLTAGE SOURCE CONNECTED DIRECTLY ACROSS EACH OF SAID POTENTIOMETERS, DRIVE MEANS COUPLING SAID SHAFT AND THE SLIDABLE CONTACT OF ONE OF SAID POTENTIOMETERS FOR RELATIVE MOVEMENT THEREWITH, A PAIR OF TRANSISTOR EACH HAVING AN EMITTER, A BASE AND A COLLECTOR ELECTRODE, A RESISTIVE VOLTAGE DIVIDER NETWORK HAVING A CENTER TAP, AND HAVING ONE END THEREOF CONNECTED TO THE SLIDABLE CONTACT OF SAID ONE POTENTIOMETER, SWITCH MEANS SELECTABLE OPERABLE FOR CONNECTING INDIVIDUALLY ONE OF THE SLIDABLE CONTACTS OF THE REMAINING POTENTIOMETERS TO THE OTHER END OF SAID DIVIDER NETWORK, FIRST MEANS RESPONSIVE TO THE CONDUCTION OF THE OTHER OF SAID TRANSCAUSE SAID MOTOR TO ROTATE IN ONE DIRECTION, SECOND MEANS RESPONSIVE TO THE CONDUCTION OF THE OTHER OF SAID TRANSSISTORS TO CAUSE SAID MOTOR TO ROTATE IN THE OPPOSITE DIRECTION, SAID CENTER TAP CONNECTED TO THE EMITTERS OF BOTH TRANSISTORS, THE BASE ELECTRODE OF SAID ONE TRANSISTOR CONNECTED INTERMEDIATE SAID CENTER TAP AND ONE END OF SAID DIVIDER, THE BASE ELECTRODE OF SAID OTHER TRANSISTOR CONNECTED INTERMEDIATE SAID CENTER TAP AND THE OTHER END OF SAID DIVIDER, WHEREBY SAID MOTOR WILL CAUSED TO ROTATE TO A POSITION AT WHICH THE POTENTIALS AT THE SLIDE CONTACTS OF THE POTENTIOMETERS CONNECTED ACROSS SAID DIVIDER NETWORK WILL BE EQUAL.