| 摘要 |
FIELD: book covers. ^ SUBSTANCE: end sheet has at least sheet made of a synthetic material and part which is made of a strip secured to the edge of the sheet and whose flexibility is higher than that of the sheet. The end sheet is provided with means for enhancing the rigidity of the part which is made of a strip. The means is mounted at a distance from the sheet edge to provide flexible part to be interposed between the sheet and the means. ^ EFFECT: eased end sheet opening. ^ 10 cl, 10 dwg |
