| 摘要 |
The document (p) has a security indicia on all or part of its surface, formed of a base and two images. The whole of the surface of the indicia is formed of groups of section of lines which are parallel and in relief at different heights (n2,n3). The lines extend alternately in two different directions so that those in one group are not parallel to those in another. - The periphery of each group defines a flat geometrical figure which combines with others to form the design. One image is formed by the upper relief sections in one direction, and the other is formed by the upper relief sections in the other direction.
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