| 摘要 |
The stiffening element in the interior of the box formed by metal cover sheets (6,7) consists of a number of strips (12) of paper or cardboard whose width corresponds to the clear space between the cover sheets. These strips are glued to one another to produce a single unit in such a way that they can be pulled out to form a honeycomb type structure (13) whose faces are then glued to the cover sheets.
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