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*Classification Numbers can be found [http://www.uspto.gov/web/patents/classification/selectnumwithtitle.htm herePatent Classification Numbers].*USPTO's new visual database, PatentsView, can be found [http://www.patentsview.org/web/ hereUSPTO Visual Database, PatentsView].
*[https://www.google.com/googlebooks/uspto-patents-pair.html#AvailableApplications USPTO PAIR (Patent Application Information Retrieval)]

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