"Droit." . . "France." . . "Brevets d'invention Droit France." . . . . . . "The French law and practice of patents for inventions, improvements, and importations"@en . "The French law and practice of patents for inventions, improvements, and importations" . . . . . . . . . . . "The French law and practice of patents for inventions, improvements and importations, by A. Perpigna" . . . . . . . "Perpigna on patents and inventions" . "Perpigna on patents and inventions"@en . . . "Livre électronique (Descripteur de forme)" . . . . . . "Ressource Internet (Descripteur de forme)" . "Hein Online." . . "Brevet d'invention." . . . .