| 摘要 |
<p>A file cover has paper-penetrating prongs which are secured in the assembly by engagement with a mounting channel and at least one of which is slidable along the channel whereby the spacing between them is infinitesimally adjustable. A retainer for each prong is preferably an apertured block borne by a parallel channel member, at least one of the blocks being slidably movable in the parallel channel member.</p> |
