Electrical question and answer matching device

Claim 1

A QUESTION AND ANSWER MATCHING DEVICE OF THE CHARACTER DESCRIBED, COMPRISING A BASE PLATE, A PLURALITY OF PRINTED CIRCUITS FORMED ON SAID BASE PLATE, FIXED CONTACT ELEMENTS CONNECTED TO SAID BASE PLATE AND PRINTED CIRCUITS, A PAIR OF CONDUCTOR PLATES MOUNTED IN CO-PLANAR RELATION ABOVE SAID BASE PLATE, A PLURALITY OF SPRING CONTACT ELEMENTS CONNECTED TO SAID CONDUCTOR PLATES IN REGISTRATION WITH SAID FIXED CONTACT ELEMENTS, A PUNCHED, CODED QUESTION CARD ADAPTED TO BE INSERTED BETWEEN THE SPRING CONTACT ELEMENTS OF ONE OF SAID CONDUCTOR PLATES AND THE CORRESPONDING FIXED CONTACT ELEMENTS ON THE BASE PLATE, A PUNCHED, CODED ANSWER CARD ADAPTED TO BE INSERTED BETWEEN THE SPRING CONTACT ELEMENT OF THE SECOND CONDUCTOR PLATE AND THE FIXED CONTACT ELEMENTS OF THE BASE PLATE IN REGISTRATION THEREWITH, A SOURCE OF ELECTRIC CURRENT, AN ELECTRICAL SIGNALING DEVICE AND A MANUALLY OPERATED SWITCH CONNECTED IN SERIES ACROSS SAID CONDUCTOR PLATES, SAID SPRING CONTACT ELEMENTS BEING NORMALLY BIASED INTO ENGAGEMENT WITH THE FIXED CONTACT ELEMENTS AND COMPRISING NORMALLY CLOSED SWITCHES, THE IMPERFORATE PORTIONS OF SAID CARDS BEING ADAPTED TO DISENGAGE SAID SPRING CONTACT ELEMENTS FROM SAID FIXED CONTACT ELEMENTS, THEREBY OPENING SAID SWITCHES, ONLY THOSE SPRING CONTACT ELEMENTS WHICH REGISTER WITH THE PUNCHED HOLES IN SAID CARDS REMAINING IN ENGAGEMENT WITH THEIR CORRESPONDING FIXED CONTACT ELEMENTS, SAID ANSWER CARDS BEING SQUARE-SHAPED SO THAT THEY MAY BE INSERTED INTO SAID QUESTION AND ANSWER MATCHING DEVICE IN ANY ONE OF FOUR DIFFERENT POSITIONS, THE HOLES BEING SO LOCATED IN SAID CARDS THAT ONLY WHEN THE CARDS ARE PROPERLY ORIENTED DO SAID HOLES REGISTER WITH THOSE SWITCH ELEMENTS WHICH WILL YIELD A CORRECT ANSWER.