Synchronism for punched card reading system

Claim 1

IN A CARD READING SYSTEM THE COMBINATION WHICH COMPRISES: (A) STRUCTURE FORMING A CARD WAY, (B) DRIVE MEANS FOR ENGAGING EACH CARD PLACED IN SAID WAY AND FOR MOVING EACH SAID CARD THERETHROUGH IN UNIFORM STEPS, (C) A COMMUTATOR DISK ROTATED IN SYNCHRONIZM WITH SAID DRIVE MEANS, (D) A FIRST RING OF SPACED APART CONTACTS ON SAID DISK AND A FIRST BRUSH MEANS IN THE COMMUTATOR, SAID DISK AND SAID BRUSH MEANS BEING MOVABLE, RELATIVE TO EACH OTHER INTO CLOSED CIRCUIT RELATION AT EACH COMMUTATOR POSITION CORRESPONDING WITH THE TERMINUS OF A STEP OF SAID CARD AND INTO OPEN CIRCUIT RELATION AT EACH HALF STEP POSITION, (E) A SECOND RING OF SPACED APART CONTACTS ON SAID DISK AND A SECOND BRUSH MEANS IN SAID COMMUTATOR, ONE OF SAID SECOND RING AND SAID SECOND BRUSH MEANS BEING OFFSET RELATIVE TO SAID CONTACTS OF SAID FIRST RING AND SAID FIRST BRUSH MEANS AND MOVABLE ONE RELATIVE TO THE OTHER INTO CLOSED CIRCUIT RELATION AT EACH SAID HALF STEP POSITION AND INTO OPEN CIRCUIT RELATION AT EACH SAID TERMINUS, AND (F) A CONTROL CIRCUIT CONNECTED AT ONE TERMINAL TO BOTH SAID BRUSH MEANS AND THE OTHER TERMINAL FORMED OF A CONTINUOUS CONDUCTIVE RING IN SAID COMMUTATOR CONNECTED TO ALL EXCEPT A SELECTED FRACTION OF SAID SPACED CONTACTS IN BOTH SAID FIRST RING AND SAID SECOND RING FOR GENERATING A CONTROL FUNCTION AT ANY TERMINUS OR HALF STEP POSITION OCCUPIED BY MEMBERS OF SAID SELECTED FRACTION OF SAID CONTACTS.