“Invented by G. Koppmann and introduced in Hamburg in 1924 by the German financier Josef-Peter Welker, from whom the product took its name (Wall and Jordan 1940: 330), Jos-Pé was a complete color system that included a one-exposure camera, ...
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Pénichon, Sylvie (2013): Twentieth Century Colour Photographs. The Complete Guide to Processes, Identification & Preservation. London, Los Angeles: Thames & Hudson, p. 135.
