1) The document describes improvements to hinges for cardboard boxes that allow the lid to be held open at a desired angle when opened.
2) Specifically, it involves a strip of paper or other rigid material secured to the lid and slidable with respect to the box body, with friction between the strip and box body holding the lid open.
3) The hinge replaces the usual inside hinge and avoids the need for tapes to hold the lid open, allowing adjustable display of items inside the box.