| 摘要 |
The box file consists of two halves (1, 1') made from cut and folded panels of a semi-rigid plastic material, hinged along two adjacent edges by two or more solid rings (11, 12) and fastened along their opening edges e.g. by Velcro(RTM) strips. The rings are fitted to the edges of the box halves by slots and half-round holes cut in the edges.
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