| 摘要 |
A sales box in the form of a book made of PVC or other thermoformable material which is laminated with cardboard for stabilisation and whose box and lid part consist of one piece, wherein notches or grooves are made in the part, whose width depends on the desired height of the box, located between the box and lid parts. The notches or grooves expand or contract during opening and closing of the box and guarantee elastic functioning of the back, while the outer and inner edges of the box and the lid taper from the top downwards at the edge and thus form a clamping closure.
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