Loose leaf book binder with holder(s) - which are joined to covers via additional folding grooves allowing full opening

摘要

The book-binding is particularly for loose leaves.It has at least one holder for the latter with two parallel folding grooves on opposite sides of the stiff back. The holder (2) is joined via two lugs (3) to the covers (4), each of which contains an additional folding groove (R1,R4), parallel and adjacent to the first ones (R2,R3). The additional grooves are at unequal distances from the first ones, the discrepancy being equal to half the distance between the first ones. USE/ADVANTAGE - Particularly as a pocket book, allowing max.opening, while avoiding damage to binder.