A multi-sheet article comprising a plurality of sheets is disclosed. Each of the sheets has opposite first and second faces that share a common perimeter edge. Each sheet also has an edge margin that extends from a portion of the perimeter edge of the respective sheet. The edge margins of the sheets...http://www.google.es/patents/US6940377?utm_source=gb-gplus-sharePatente US6940377 - Multi-sheet article having removable portions comprising magnetized material
Multi-sheet article having removable portions comprising magnetized material
