| 摘要 |
PROBLEM TO BE SOLVED: To improve the durability and outward appearance of a file with a back cover, the width of which is made variable. SOLUTION: The file has a front cover 1, a back cover 4 and a spine 3, and the front cover 1 is formed into a bag into which the spine 3 can be inserted so as to make the width of the spine 3 changeable, and the front cover 1, the back cover 4 and the spine 3 are all made of a resin and further no folding line is provided in the spine 3. COPYRIGHT: (C)2004,JPO
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