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similarities of Perka 1 Präzisionskamera and Linhof Standard camera (original Technika) discussed in German
Herr Heinrich Gerl was no longer managing director from the beginning of 1930 (Die Photographische Industrie 15. Jan. 1930 p60). --Heritagefutures (talk) 22:19, 15 December 2012 (PST)