| 摘要 |
File, consisting of a front sheet (2) and a rear sheet (3) made of a rigid material which are connected to each other by a flexible back (4), and whereby at least one of the said sheets (2-3) is provided with an inwardly directed flap (5) which is kept at its side edges by means of connecting pieces (6) at a distance from the concerned sheet (2-3) to which this flap (5) is attached characterized in that the connecting pieces (6) are at least attached to the concerned sheet (2-3) and the flap (5) by means of mere mechanical connections.
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