"United States." . . "EE.UU. Patent Office." . . "EE.UU. Patent and Trademark Office." . . "Patents." . . "United States. Patent and Trademark Office." . . "United States. Patent and Trademark Office," . "United States. Patent and Trademark Office" . . . "Patents United States." . . "Patentes EE.UU. Manuales, guías, etc." . . "Patentes EE. UU. Manuales, guías, etc." . "Patents United States Handbooks, manuals, etc." . . "Periodicals"@en . . . . . . . . . "General information concerning patents : [a brief introduction to patent matters]"@en . . "General information concerning patents"@en . "General information concerning patents" . . . "General information concerning patents : a brief introduction to patent matters"@en . . . "General information concerning patents : for information on proceeding with a patent see patents & inventions: an information aid for inventors" . . . . . . . . . . . . . . . . . . . . . "General Information Concerning Patents" . . "Handbooks and manuals"@en . "Handbooks and manuals" . . . . . "A brief introduction to patent matters."@en . . . . . . . . . . . . "General information concerning patents : a publication of the United States Patent and Trademark Office"@en . . . . . . . "Handbooks, manuals, etc"@en . . . . . . .