| 摘要 |
The document folder has a cover (1) with a size larger to that of the leaves (2) which it protects. The edges (10) of the leaves and the cover (11) are rounded at their ends (6,7). The edges of the leaves have a series of perforations (3) with a rectangular form with a central part extended by a dovetail groove which receives the rings of the spiral (5). The cover (3) has, on the central part of the edge, a series of perforations (8) of rectangular shape. These perforations define a dovetail groove to connect the cover and leaves.
|
