Dia_259-123

DE: Patentschrift: Dr. Rudolf Steinheil, Objektiv für photographische Zwecke, 30.09.1896, Patent Nr. 13233 (S. 1)
EN: Patent specification: Dr. Rudolf Steinheil, Lens for photographic purposes, Sept. 30, 1896, Patent No. 13233 (p. 1).

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