System for manufacturing maps

Claim 1

A COMBINATION OF THE TYPE DESCRIBED FOR MARKING A SECONDARY MAP OF AN AREA THAT IS A FRACTION OF A LARGER AREA COMPRISING: A MASTER MAP OF SAID LARGER AREA, THE PART OF THE MAP REPRESENTING SAID LARGER AREA BEING DIVIDED INTO SECTIONS SEPARATED BY BOUNDARY LINES, EACH OF SAID SECTIONS BEING IDENTIFIED BY AN AREA CODE SYMBOL THEREON; DETAIL MAPS OF THE RESPECTIVE SECTIONS, EACH OF SAID DETAIL MAPS BEARING LEGENDS IDENTIFYING FEATURES OF THE AREA REPRESENTED BY EACH SAID DETAIL MAP; A DECK OF INDEX CARDS COMPRISING A PLURALITY OF SUBDECKS TO SEPARATE GROUPS OF INDEX CARDS CORRESPONDING RESPECTIVELY TO EACH OF SAID DETAIL MAPS, EACH OF SAID INDEX CARDS BEARING A RECORD OF A LEGEND OF A FEATURE ON THE CORRESPONDING DETAIL MAP, EACH OF SAID INDEX CARDS BEING A PUNCHED CARD HAVING FIRST, SECOND, AND THIRD FIELDS IN SPECIFIC LOCATIONS THEREON FOR THE RECORDING OF INDEXING INFORMATION, EACH OF SAID CARDS BEARING IN ITS FIRST FIELD A CODE SYMBOL OF THE SECTION IN WHICH THE LEGEND ON SAID EACH RECORD IS REPRESENTED IN SAID DETAIL MAP AND ALSO BEARING IN SAID SECOND AND THIRD FIELDS RESPECTIVELY INDICIA INDICATING THE LOCATION WHERE SAID LEGEND APPEARS ON SAID DETAIL MAP, SAID CODE SYMBOLS BEING IN THE FORM OF PERFORATIONS PUNCHED IN ALPHANUMERIC CODE, CONGRUENT LOCATIONS ON THE RESPECTIVE DETAIL MAPS BEING REPRESENTED BY IDENTICAL INDICIA PUNCHED ON THE PUNCHED CARDS IN FIELDS THEREON CORRESPONDING TO SAID CONGRUENT LOCATIONS ON SAID DETAIL MAPS.