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UNITED STATES PATENT AND TRADEMARK OFFICE
PATENTE AMERICANA 7637254B2 DIC-29-2009
PATENTE AMERICANA 8667951B2 MAR-11-2014
PATENTE AMERICANA 8800536B2 - AUG-12-2014
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EUROPEAN PATENT OFFICE
INSTITUT NATIONAL DE LA PROPIÉTÉ INDUSTIELLE
DEUTSCHES PATENT - UND MARKENAMT
UK INTELLECTUAL PROPERTY OFFICE
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THE GOVERNMENT OF THE HONG KONG SPECIAL ADMINISTRATIVE REGION
THE GOVERNMENT OF THE HONG KONG SPECIAL ADMINISTRATIVE REGION
The library of the United States Congress Law library