To illustrate the development of prussian fuzes I recently arranged the following photo. In the top row you can see the impact fuzes (from left to right): c/61, verlängerte Zündvorrichtung, Feldgranatzünder c/73, a shorter version of c/73, two experimental c/73, a sectioned c/80, another c/80, and the c/82 impact fuze. This development resulted in Bolzenschraube 85 (@Alpini, please correct me if I'm wrong), the red item on the very bottom. The bottom row exhibits the time fuzes starting with "Richterscher Zeitzünder", an experimental fuze between Feldschrapnellzünder c/70 and c/73, Feldschrapnellzünder c/72, c/73, and c/83. On the right you can see Doppelzünder 86 (double effect fuze) combining the "benefits" of time and impact fuzes.