1882 - W. Weltersbach: “Jagd-Schliefsmesser mit Patronenschlüssel und Patronenwringer”. The lever-release design for this knife was patented by Wilhelm Weltersbach: pivot pin and two sear holes, blade stop pin, lever, sear pin, and sear spring. In these manual lever-release designs, the lever is used to release the blade in the open and closed position. In the closed position, the tang opening on the opposite side of the blade stop pin functions as a pinfire shell extractor. This design became very popular and was produced in a variety of knife models. It is also the basic design (with some modifications) for the enormously popular Leverlock knife that still today is produced by the German company Hubertus.