La poste par pigeons voyageurs: Souvenir du siége de Paris

Prudent René-Patrice Dagron

René Prudent Patrice Dagron was a French photographer and inventor. He was born in Aillières-Beauvoir, Sarthe, France. On 21 June 1859, Dagron was granted the first microfilm patent in history. Dagron is also considered the inventor of the miniature photographic jewels known as Stanhopes because a modified Stanhope lens is used to view the microscopic picture attached to the lens. He is buried at Ivry Cemetery, Ivry-sur-Seine.