| 摘要 |
PCT No. PCT/GB89/00458 Sec. 371 Date Oct. 10, 1990 Sec. 102(e) Date Oct. 10, 1990 PCT Filed May 8, 1989 PCT Pub. No. WO89/11140 PCT Pub. Date Nov. 19, 1993.A sheet of material having a first set of concertina folds and, so as to be transverse to these when the sheet is folded with these folds, a second set of concertina folds, the sheet being provided with two diagonally opposite holding portions at segments thereof, which segments are at or near diagonally opposite corners of the sheet and defined by folds and/or edges thereof, one of the holding portions being stiff and the opposite holding portion having a part extending beyond the remainder of the sheet when folded, so as to be suitable to be held in a binder; the part may be pre-bound in a book or may have punch-holes, suitable for a ring-binder; the material, part from the stiff portion, may be of paper-like plastics material that is tear-resistant. |
