| http://www.w3.org/ns/prov#value | - Preferably, the halftone blind embossing occupies a surface of 0.25 square centimeters to several square centimeters. [0023] The halftone blind embossing can represent any geometrical element, e.g. with a circular, triangular, square or asymmetric outline structure, a pictorial symbol, character or other symbol.
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