![]() German patent 670241, filed 21 August 1934 and granted 22 December 1938.This patent of a design by Ernst Altenberger is the first to show a safety that moves the firing pin upward German patent 679683, filed and granted 20 July 1939.This is Ernst Altenberger’s patent for the barrel retention and release mechanism used in many of the The idea may have come from the barrel retention mechanism of the WTP, which places the mechanism behind the trigger and requires anĮxtension of the frame behind the trigger guard. The new method is more elegant in that the mechanism is mostly hidden from view and is spring-loaded. ![]() It requires the trigger guard toīe extended toward the front rather than the rear.
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