300px-US_patents_1790-2008

English: Patents Granted 1790-2008 (divided into utility patents, design patents, plant patents, and patents granted to foreign residents) Deutsch: Erteilte Patent 1790-2008 (unterteilt in Gebrauchsmuster, Geschmacksmuster, Biopatente und Patente die an nicht US Bürger vergeben wurden) (Photo credit: Wikipedia)

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