Security diffraction devices difficult to exactly duplicate
Security document
Sheet folding method and apparatus
Sheet-material authenticated item with reflective-diffractive au
Street address locating aid
Surface relief hologram structure with reflection from an air in
Symbols for identifying characteristics
System and method for personalized medication treatment manageme
System for identifying stars, planets, deep sky objects and cons
System for printing tamper-resistant electronic form characters
System for printing value indicia with diagrammatic data represe
System for tracking secure medical test cards