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2018
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Invention
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Method and device for document security by generating multiple reflective and transmissive latent... |
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Invention
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Two-sided transparent window feature with dichroic dyes. The present invention is directed toward... |
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2017
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Invention
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Method for manufacturing personalised optical document security elements and the element obtained... |
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2015
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Invention
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Optical device and method for achieving multiple latent images for document security. The present... |
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Invention
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Optical element and production method with multiple latent images for document security. The inve... |
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Invention
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Method and device for achieving document security by generating multiple reflexive and transmissi... |
