| 摘要 |
A system for indexing releasably bound numerically categorized textual material provides a high degree of convenience. A plurality of dividers is provided each of which corresponds to and separates alpha numerical categories and each divider has a tab associated therewith. Each tab includes means for displaying indicia which include at least the last digit of the respective alpha numerical category. The releasably bound assembly of textual material has an edge-face portion which is divided into a number of fields equal to the number of possible last character of alpha numerical categories. Each field corresponds to the last character of a numerical category and contains a bank of tabs arranged sequentially in superposed relationship. Each tab in a respective bank of tabs has the same last character, e.g., digit. The system provides for frequent revision, such as removal of some categories and addition of other categories along with the respective dividers and associated tabs while maintaining the same high degree of order and convenience, even after extensive revision.
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