| 摘要 |
A four sided box formed from a substantially rectangular blank having reinforced side walls formed of inner and outer side panels, which inner side panels are extensions of the outer side panels folded to lie flat against the inner faces of the walls, the adjacent edges of the inner side panels having matching projections and indentations which form mating locks when the panels are folded into place and the adjacent edges of the inner side panels are pressed against each other.
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