| 摘要 |
The present invention relates to a file for computer papers having rows of equidistant perforations along two opposite edges. This file is characterised in that the flat part 5 of the blank 1 is extended, away from the first spine 3, in the form of a second spine 7 approximately equal in width to the first spine 3, the second spine 7 is extended in the form of a cover 9 approximately equal in width to the flat part 5, and the cover 9 is extended in the form of a closing flap 11 approximately equal in width to the first spine 3 and attached to the cover 9 along a transverse fold line 12. <IMAGE>
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