4. Printed matter
  5. Having revealable concealed information, fraud preventer or...
  6. Utilizing electromagnetic radiation

Theodor Burchard

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Magnetic metallic safeguarding thread with negative writing

Printed matter – Having revealable concealed information – fraud preventer or... – Utilizing electromagnetic radiation
Patent

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Magnetic metallic safeguarding thread with negative writing and

Printed matter – Having revealable concealed information – fraud preventer or... – Utilizing electromagnetic radiation
Patent

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Security element and process for producing the same

Optical: systems and elements – Polarization without modulation – By relatively adjustable superimposed or in series polarizers
Reexamination Certificate

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Sheeting and methods for the production thereof

Liquid crystal cells – elements and systems – Nominal manufacturing methods or post manufacturing...
Reexamination Certificate

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Profile ID: LFUS-PAI-P-893188

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