Book of changeable sheets that can also be used for filing cabinets. (Machine-translation by Google Translate, not legally binding)

摘要

Book of changeable sheets that can be used the same for filing cabinets, characterized by two covers with metal spines fixed to them with steps or openings for fixing one end of them on one of the spines and the other end to a transverse piece with threaded passage which runs through a rod or threaded shaft armed in bearings inside one of the covers, which is operated by handle or key engageable; carrying between the loins of the pastas two metallic strips between which pass the ribbons and press the leaves. (Machine-translation by Google Translate, not legally binding)