| 摘要 |
<p>A manually filled and operated binder for stacks of similarly apertured sheets, having a sidewall pierced at mutually spaced points. The outer aspect of the apertured wall is countersunk at the pierce hole. The opposite wall is provided with recessess aligned with the countersunk aperture for receiving pins to secure sheets having apertures in alignment with the apertures of the sidewalls.</p> |
