| 摘要 |
PROBLEM TO BE SOLVED: To input a patent classification code to display the progress of revision of this classification code. SOLUTION: An input code is retrieved in one version. When retrieval is not successful, it is terminated; but when retrieval is successful, a classification code to be a source or a destination is retrieved in a correspondence table on the side of an adjacent old version or a new version to obtain a correspondence code, and correspondence codes to be the source and the destination are retrieved in respective corresponding correspondence tables, and retrieval is repeated to display the input code, correspondence codes, version numbers of versions where they exist. They are displayed as a classification progress table in a list.
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