| 摘要 |
<p>A structure consisting of an assembly of rigid panels having a relatively low weight, which are so connected as to form one or more arches spanning the bottom. An arch consists of flat panels, which are connected together convexly or concavely. The assembly is movable between a flat position and an erected position, in which flat position a flat surface is formed, and in which erected position the structure is formed.</p> |
