"peek-a-boo" retrieval system

Claim 1

IN A SYSTEM FOR INDEXING MEDICAL INFORMATION, THE COMBINATION OF A FIRST DECK COMPRISING A PLURALITY OF SYMPTON CARDS, AND A SECOND DECK COMPRISING A PLURALITY OF MEDICAL FIELD CARDS, ADN A MASTER INDEX CARD, ALL OF SAID CARDS BEING OF THE SAME SIZE AND SHAPE WHEREBY SELECTED GROUPS OF CARDS MAY BE STACKED IN A UNIFORM MANNER, ALL OF SAID SYMPTOM CARDS BEING SEMI-TRANSPARENT, A PLURALITY OF INDENTICAL COORDINATE LOCATIONS ON THE RESPECTIVE CARDS BEING SUPERPOSABLE WHEN SELECTED CARDS ARE SO STACKED, EACH OF SAID COORDINATE LOCATIONS CORRESPONDING TO A DIFFERENT DISEASE, SAID MASTER INDEX CARD BEING PERFORATED AT EACH DISEASE LOCATION, A LEGEND LOCATED ADJACENT EACH OF SAID COORDINATE LOCATIONS ON SAID INDEX CARD FOR IDENTIFYING THE DISEASE ASSOCIATED WITH SAID EACH LOCATION, EACH OF SAID SYMPTOM CARDS BEING PERFORATED AT EACH COORDINATE POSITION THEREUPON CORRESPONDING TO EACH DISEASE WITH RESPECT TO WHICH THE SYMPTOM REPRESENTED BY THE CARD IS ASSOCIATED, EACH OF SAID SYMPTOM CARDS BEING PERFORATED IN A DIFFERENT PATTERN OF COORDINATE POSITIONS THAN EACH OF THE OTHER SYMPTOM CARDS, BUT SOME OF SUCH SYMPTON CARDS BEING PERFORATED IN THE SAME POSITIONS EACH SYMPTOM CARD BEARING A LEGEND IDENTIFYING THE SYMPTOM ASSOCIATED WITH DISEASES REPRESENTED BY DATA RECORDED ON THAT CARD, EACH OF SAID FIELD CARDS BEING TRANSPARENT AT A PLUALITY OF ADJACENT COORDINATE POSITIONS CORRESPONDING TO DISEASES IN A GROUP CHARACTERISTIC OF A SPECFIC FIELD OF MEDICINE, DIFFERENT FIELD CARDS BEING TRANSPARENT IN DIFFERENT LOCATIONS IN DIFFERENT AREAS OF THE RESPECTIVE FIELD CARDS.