Foto de stock - 07 September 2020, Saxony, Krippen: Gravestone of Friedrich Gottlob Keller at the Krippen cemetery in Saxon Switzerland. Friedrich Gottlob Keller was born on 27.06.1816 in Hainichen and died on 08.09.1895 in Krippen. Keller invented paper production by groundwood pulp in the 19th century and still shapes the paper industry with this process today. Photo: Daniel Schäfer/dpa-Zentralbild/ZB. - Krippen/Saxony/Germany

Imagen: 07 September 2020, Saxony, Krippen: Gravestone of Friedrich Gottlob Keller at the Krippen cemetery in Saxon Switzerland. Friedrich Gottlob Keller was born on 27.

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