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Data carrier having a picture theme superimposed by a line patte

Printed matter – Having revealable concealed information – fraud preventer or... – Utilizing superposed layers
Patent

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Document security system

Printed matter – Having revealable concealed information – fraud preventer or... – Utilizing superposed layers
Patent

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Document with anti-counterfeiting means to prevent reproducibili

Printed matter – Having revealable concealed information – fraud preventer or... – Utilizing superposed layers
Patent

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Documents containing information invisible to the naked eye

Printed matter – Having revealable concealed information – fraud preventer or... – Utilizing superposed layers
Patent

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