Eugen Hermanni
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E. Leitz Photographic Patents by Eugen Hermanni
- 1958 AUG 21 - PHOTOGRAPHIC OBJECTIVE (7 / 5) with Otto Zimmermann and Gustav Kleinberg
- 1961 APR 11 - PHOTOGRAPHIC OBJECTIVE (9 / 7) with Heinz Marquardt, Otto Zimmermann and Gustav Kleinberg