| 摘要 |
A post card comprises a base with a bending line and a loose leaf and is made with possibility of transformation into a book flat form. The base has technical holes for fastening the loose leaf, a cover is made from the outer side of the base, and flat parts of the loose leaf are fastened with opposing slots and secured with locks. All ribs of the loose leaf are parallel to the sheets of the cover and are made with possibility of turning relative to the axes of fastening parts at opening and rotation for 90° relative to each other at full opening. |
