Trademarkia claims to be the "largest, most accurate, and most complete free search engine for U.S. federally registered trademarks... ...[with] contextual information about the current use of interesting business names, slogans, and logos through pictures, commercials, and conversations from Flickr, Google, Youtube, and Twitter for each U.S. trademark filed in with the United States Patent and Trademark Office (USPTO) since the year 1870."
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