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*The NBER data considers only [http://www.uspto.gov/web/offices/ac/ido/oeip/taf/patdesc.htm Utility Patents]
*Various [http://www.uspto.gov/patents/resources/classification/index.jsp USPTO resources] are available to help understand patent classifications
If you have an account with the NBER then you might want to view the [[NBER Account Setup]] page
