Device for holding several leaves together

A holding device for a plurality of leaves forming a file including a first leaf and a last leaf, comprising:

• (a) an upper element having an inner face which is adapted to press against the first leaf only at a corner of the file to be held;
• (b) a lower element having an inner face which is adapted to press against the last leaf only at the corner of the file to be held;
• (c) a hinge-forming part between the upper and lower elements and arranged along a first side of the upper element and along a first side of the lower element, said first sides being parallel with a first side of the file of leaves;
• (d) a primary resilient interlocking component on the inner face and along a second side of the upper element, parallel with a side contiguous to the first side of the file;
• (e) a secondary resilient interlocking component on the inner face and along a second side of the lower element corresponding to the second side of the upper element, adapted to cooperate with the primary component by resilient interlocking in releasable manner, so as to hold the upper and lower elements in assembled position with said upper and lower elements exerting compression forces on the file and locating the leaves of the file,
• the upper and lower elements being flat, and
• the first and second sides of said upper and lower elements being shorter than the respective first and second sides of the file of leaves.