| 摘要 |
<p>The book protector enables a book to be covered. It consists of a sheet (1) with two sides (2) bent and welded to form a book protector envelope. The other two sides are folded down and, after cutting to allow the book hinge to pass through form four protecting tongues (5). The four tongues are stapled together in pairs, with the help of guide notches. The materials can be varied, paper or plastic in combination with stretchable material for the hinge.</p> |
