An improved rosette for securing a disc having a central aperture includes a raised cylindrical hub projecting upward from a planar base, the hub being formed of first and second upstanding annular sections having substantially cylindrical side walls1, the first annular section comprising at least 180.degree....http://www.google.es/patents/US6123192?utm_source=gb-gplus-sharePatente US6123192 - Rosette with release tab for holding disc shaped elements
Rosette with release tab for holding disc shaped elements
