| 摘要 |
<p>The device (1) comprises a spine, a cover which can be folded shut with front and back parts (3, 4) and a clamp (2) pivotally secured to the back cover. The clamp is in contact with the spine and extends over parts of the front and back covers when closed. The front cover contains a window (6) so that it can be folded open when the clamp is closed. When the cover is folded shut, the clamp can be pivoted through an angle into an open position where it is released from the front and back covers. When the cover is folded flat in an open position, the window in the front cover allows the clamp to be pivoted into a position where it is released from the front and back covers.</p> |
