You may do a CIPO┬átrademark search on the CIPO database: http://www.ic.gc.ca/app/opic-cipo/trdmrks/srch/tmSrch.do?lang=eng   and a USPTO trademark search on the USPTO TESS database: http://www.uspto.gov/trademarks-application-process/search-trademark-database and a global trademark search on the WIPO brand database at: http://www.wipo.int/portal/en/index.html

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