Method of making a beaded retro-reflective material comprising embedding beads in a generally planar plastic matrix and embossing the material so that axes of exposed portions of the beads lie at varying angles to the general plane of the matrix....http://www.google.es/patents/US3989775?utm_source=gb-gplus-sharePatente US3989775 - Method of making a retro-reflective beaded material
Method of making a retro-reflective beaded material
