Perforated key word card

Claim 1

IN AN INFORMATION FILE CARD SYSTEM HAVING A SERIES OF UNSORTED FILE CARDS EACH CONTAINING INFORMATION FALLING WITHIN THE SCOPE OF AT LEAST ONE KEY WORD, EACH FILE CARD HAVING ALONG AT LEAST ONE EDGE THEROF HOLES AND AT LEAST ONE NOTCH, WHICH NOTCH CORRESPONDS TO THE INFORMATION ON THE CARD, AND EACH FILE CARD HAVING A PORTION OF THE EDGE THEREOF CONTOURED IN A SHAPE FOR MATCHING SIMILARLY CONTOURED EDGE PORTIONS OF THE OTHER FILE CARDS, SO THAT TO SELECT FROM THE SERIES OF CARDS ALL CARDS HAVING INFORMATION WITHIN THE SCOPE OF A KEY WORD A NEEDLE IS PASSED THROUGH THE APERTURES AND NOTCHES IN THE ALIGNED CARDS IN AN APPROPRIATE POSITION AND THE CARDS NOTCHED AT THAT POSITIONN DROP OUT OF THE ALIGNED CARDS AND THE REMAINDER OF THE CARDS ARE RETAINED ON THE NEEDLE, THAT IMPROVEMENT COMPRISING, A PLURALITY OF KEY WORD CARDS EACH HAVING A SINGLE KEY WORD THEREON, AT LEAST ONE EDGE OF EACH KEY WORD CARD IN SAID PLURALITY HAVING THEREIN AT LEAST ONE FIRST NOTCH CORRESPONDING TO THE KEY WORD OF THE CARD, SAID NOTCH OCCUPYING A UNIQUE POSITION ON THE KEY WORD CARD WITH RESPECT TO THE SAID FIRST NOTCHES ON THE OTHER KEY WORD CARDS, EACH KEY WORD CARD HAVING A PORTION OF THE EDGE THEREOF CONTOURED IN A SHAPE FOR MATCHING THE SIMILARLY CONTOURED PORTIONS OF THE EDGES OF THE FILE CARDS FOR CORRECTLY ORIENTING EACH KEY WORK CARD WHEN IT IS PLACED AGAINST THE FILE CARDS SO THAT SAID FIRST NOTCH REGISTERS WITH THE NOTCHES OF ALL CARDS IN THE FILE CARDS HAVING INFORMATION THEREON FALLING WITHIN THE SCOPE OF THE RESPECTIVE KEY WORD CARD, SAID KEY WORD CARDS EACH HAVING MEANS THEREON FOR VISUALLY INDICATING SAID AT LEAST ONE FIRST NOTCH, AND KEY WORD CARRYING MEANS ON EACH OF SAID KEY WORD CARDS HAVING INDICATED THEREON THE KEY WORD, SAID KEY WORD CARRYING MEANS ON EACH CARD OCCUPYING A UNIQUE POSITION ON THE CARD FOR THE GROUP OF KEY WORD CARDS SO THAT EACH KEY WORD CARD WILL BE VISIBLE IN SAID PLURALITY OF KEY WORD CARDS WHEN THEY ARE PROPERLY POSITIONED WITH RESPECT TO EACH OTHER, WHEREBY THE USER CAN FIND THE DESIRED KEY WORD CARD AT A GLANCE WITHOUT HAVING TO GO THROUGH THE ENTIRE PLURALITY OF KEY WORD CARDS AND THE USER CAN USE THE RESPECTIVE KEY WORD CARDS WITH THE SERIES OF UNSORTED FILE CARDS WITHOUT KNOWLEDGE OF THE CODING SCHEME FOR POSITIONING THE NOTCHES.