| 摘要 |
<p>The display board is designed for showing photographs or documents, and consists of leaves (1) hinged (3) together to fold together, or to open out in a fan or concertina shape. Each leaf (1) is enclosed in a square frame (2). When folded up, the leaves (1) form an oblong parallelepiped, or cube. Each leaf (1) is hinged to the adjacent leaf along a ridge formed by one side adjacent to one of the outer surfaces (2a/2c) of the frame. These outer surfaces of the frames enclosing the leaves have a constant width.</p> |
