| 摘要 |
<p>The book has an upper book cover (1), lower book cover (2) and a spine (3), where two separate rings (4) for hanging of printed paper sheet is attached to the covers and/or to the spine. Each ring has two rigid parts that are detachably connected with each other in a connection point by a detachable snap-on connection for repeated opening and closing of the rings. One of the rings is extended in a circular-ring shaped manner. The covers or the spine have recesses in which the rings are hooked.</p> |
