File system, to hold printed sheets, has upper and lower leaf covers with a center spine, and structured openings to hold disk rings which keep them and the printed sheet together

摘要

The system to hold a printed sheet (4) has an upper leaf (1a) and a lower leaf (1b), with spaced disk rings (2) to hold the leaves and the sheet together. A spine (1c) forms a cover (1) of cardboard or plastics, with openings (3) in a double T-shape to hold the rings in a snap fit.