| 摘要 |
This consists of a book cover with 2 extensions (ears) in the shape of a parallelogram, of the hard surface and 2 strips (bands) of the soft surface of the appliqué (Velcro, Scrats) and a special adhesive substance. It has the external appearance of a book and combines the mechanical perfection and functionality of the book and the file, thanks to the system of moving sheets and the facility to open out and narrow the spine of the book as required. It is simple in construction with low cost material, handy, ecological and resistant to outside attack. |
