| http://www.w3.org/ns/prov#value | - In the method, a supporting ink layer 2 including a pigment and containing a product that assures it a certain porosity with respect...http://www.google.com/patents/US4627642?utm_source=gb-gplus-sharePatent US4627642 - Method of marking for deterring fraud with valuable documentsAdvanced Patent SearchPublication numberUS4627642 APublication typeGrantApplication numberUS 06/772,764Publication dateD
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