There is always the USPTO drawings to refer to...not only are the drawings present, there is a description of the working device in the words of the inventor themself...the following is drawings of three Kautzky triggers and all before 1914...had these items been in theory only, it would be indicated in the upper left corner as " NO MODEL "...which is not the case here...there is a good chance that your Kautzky trigger is one of these three...very likely 1109632