Die Fotografie im Carte de Visite-Format zeigt wohl Hans Otto Ludwig (*19.03.1842 Schwamendingen; +15.04.1917 Zürich) mit seinem ältesten Sohn Hans Otto Ludwig Jr. (* 16.10.1865 Veltheim; + 12.06.1897 Zürich). Hans Otto Ludwig war ein Bruder von Wilhelm Conrad Röntgens Frau Anna Bertha Ludwig und der Vater ihrer Nichte und Pflegetochter Josephine Bertha Ludwig.
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