That sear arrangement with the long leaf spring was used by Nicolaus Dreyse in his 1841 needle fire. If he invented it is another question I cannot answer at the moment, but I doubt that. When the Mausers designed their first bolt action, the Mauser-Norris in 1867, it was a common design feature in the public domain. The Russian Moisin-Nagant uses the same sear, but noone said it was designed by Dreyse. Gun designers ever used known and prooven features. You may say as well that all bolt actions were invented by Dreyse, as they all share a bolt locked by turning.
