"Pinkerton's National Detective Agency History." . . "Détectives États-Unis Biographies." . . "Inspecteurs de police États-Unis Biographies." . . . . . . . . . . . . . "Biography"@en . . . "Biography" . . "Allan Pinkerton : the first private eye" . "History"@en . "History" . . "Around the world, his name is synonymous with security and protection. The legendary agency he began nearly one hundred and fifty years ago is still in operation today, as are many of the surveillance and infiltration techniques he originated. His company's trademark symbol, a large, unblinking eye, inspired the term private eye."@en . "Around the world, his name is synonymous with security and protection. The legendary agency he began nearly one hundred and fifty years ago is still in operation today, as are many of the surveillance and infiltration techniques he originated. His company's trademark symbol, a large, unblinking eye, inspired the term private eye." . . . . . . "Allan Pinkerton the first private eye"@en . . . . . "Biographie." . . . . "Détectives États-Unis Biographies Biographies." . . "Detectives (beroep)" . .