| 摘要 |
The halves consist of similar flat plates (1, 2), and each has an upright edge (4) running along the sides furthest from the hinge joint (5, 6, 7). The latter can be rectangular, its width being less than the sum of the heights of the halves. There can be a hinge between each of the halves and the connecting component. The latter can be housed in a channel-section rear piece typically detachable by means of a magnet.
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