| 摘要 |
In accordance with the invention a wall assembly for displaying visual messages, has a front portion, a display area in the front portion, the display area providing an opening through the wall assembly, a projection screen for covering the opening, and a display panel movable from behind part of the front portion into the display area. The wall assembly can be placed before an audience and used to display visual messages which may be shown for example by projection onto a screen, or by writing on a display panel, with a facility for covering the display area when that area is not in use.
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