Richard Wilhelm Siegfried Valentiner (*30.04.1876 Mannheim; +04.07.1971 Vlotho) war Physiker und vom Sommersemester 1901 (als Voluntär-Assistent) bis zum Sommersemester 1903 II. Assistent von Wilhelm Conrad Röntgen am Physikalischen Institut der Universität München. Einzelportrait (Schulterstück) im Viertelprofil.
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