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Pfeiffer Friedrich Wilhelm
Bildrechte: <a href="https://commons.wikimedia.org/wiki/User:HaJoRi">HaJoRi</a>, <a href="https://commons.wikimedia.org/wiki/File:Friedrich_Wilhelm_Pfeiffer.jpg">Friedrich Wilhelm Pfeiffer</a>, <a href="https://creativecommons.org/licenses/by-sa/3.0/legalcode" rel="license">CC BY-SA 3.0</a>
