| http://www.w3.org/ns/prov#value | - The material is invisible and remains unactivated in ambient light but obscures the identification code upon being exposed to radiant energies such as heat or light from within a particular...http://www.google.com/patents/US5109153?utm_source=gb-gplus-sharePatent US5109153 - Flash imaging and voidable articlesAdvanced Patent SearchPublication numberUS5109153 APublication typeGrantApplication numbe
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