It is developed by USPTO for patent classifier, patent searcher and examiner. It tells you where to find relevant prior act by seaching various databases. I guess USPTO spent millions of $$ per year to license these databases.

http://www.uspto.gov/web/patents/searchtemplates/

http://www.uspto.gov/web/patents/searchtemplates/class435.htm

http://www.uspto.gov/web/patents/searchtemplates/class436.htm

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