| 摘要 |
Method and apparatus are disclosed for effecting selection of an article or item stored in a random access system. Each article or item is provided with codifying indicia in accordance with the selected number system with the indicia comprising two independent components that are termed "number" indicia and "complemental number" indicia. In an illustrative embodiment the articles comprise sheet-form cards which are formed with a series of key-form slots arranged along one marginal edge portion with each of the slots designed to incorporate and combine both the number indicia and the complemental number indicia. Selection and removal of a numerically identifiable card is mechanically accomplished through selective operation of a similar number of selector bars with each bar cooperatively engageable with a respective key-form slot in the card. Mechanical minipulation of the selector bars in accordance with the selected number system effects a combined operation of retaining within a storage area all cards having a designating number greater than a selected number and retaining all cards having a designating number less than the selected number. In effect in this mechanical example, mechanical displacement of the selector bars in accordance with a specific numerical designation simultaneously releases all cards having a numerical designation less than this number as well as the card with the selected numerical designation and effects reengagement of the selected bars thus manipulated with all cards having a numerical designation less than the selected number.
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