| 摘要 |
<p>A booklet comprising separate front and back covers (A,B) so formed as to be magnetically attracted to each other in the closed condition of the booklet, and a paper sheet (5) which is larger than said covers in both of two mutually perpendicular dimensions when flat but is provided with fold lines (6, 6a) about which the sheet may be folded to a size corresponding to that of the front and back covers, two suitably located regions of said paper sheet being secured to the said front and back covers respectively.</p> |
