Loose-leaf holding device for books and file cabinets (Machine-translation by Google Translate, not legally binding)

摘要

A device for retaining loose sheets for books and filing cabinets, essentially constituted by an elongated spring sheet whose section is slightly arched and whose edges are bent to retain inside it two elongated and articulated parts provided with arched projections that they pass through recesses made in the fold of the spring piece and counting the device with levers for its drive located at the ends. (Machine-translation by Google Translate, not legally binding)