Encoded Material Containing Images Varying Distinctively with Variations in the Angle of View, Used for Verification Purposes and to Prevent Unauthorized Duplication-Namely, Pieces of Laminated Plastic and Metal Diffracting and Reflecting Light and Containing Three-Dimensional Patterns, which Pieces May Be Applied to Documents Such as Bank and Credit Cards, Bonds, Stock Certificates and Similar Items; Cards and Labels on which Such Pieces Are Applied