| 摘要 |
<p>The binder file is e.g. made of a strip of cardboard folded along a number of lines, with one or more elastic bands. Recesses are formed along the periphery of the folded strip (5), so that sheets with similar recesses can be secured in the file by means of the elastic bnad (4). The recesses can be at points adjacent to a fold line, their centre lines being parallel to the latter, or they can extend from the fold line, forming slots whose axes are directed towards the centre of the folded strip. The recesses can be of semi-circular section, and the elastic band can pass through a U-section member with recesses corresponding to those in the folded strip.</p> |
