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2016
|
Invention
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Optical security device. The invention relates to an optical security device (1, 1'), comprising ... |
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2014
|
Invention
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Security device. A security device includes a plurality of diffractive surface elements arranged ... |
|
|
Invention
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Security device. The invention relates to a security device for improving the security against th... |
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2013
|
Invention
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Security device.
A security device for improving the security against falsification of articles ... |
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|
Invention
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Security device. A security device for improving the security against falsification of articles h... |
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2010
|
Invention
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Security device.
A security device, which is suitable in particular for improving the anti-forge... |
