| 摘要 |
PROBLEM TO BE SOLVED: To make an upper end face of a coupling piece at a corner invisible from an upper surface of a paper box by a simple structure. SOLUTION: The coupling piece 23 provided at both ends of a double sidewall 11 is two-folded and received in a notch 25 provided on an outer end wall 12b of an adjacent double end wall 12 to be fixed. Thus the upper end face of the coupling piece 23 is not exposed from the upper surface of the box.
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