| 摘要 |
An unfolding box the base of which is quadrilateral in shape, and its sides are extended by two main flaps and two secondary flaps, respectively associated with two opposite sides by a folding line, the flaps have no folds and their width increases from the base side, their edge being convex, to decrease again towards the flap ends. The main flaps are extended by a blocking and gripping strip, the secondary flaps are curved against the edges of the main flaps bearing against them.
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