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Die große Enzyklopädie des mechanischen Rechnens

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Search results for: Hadrich, Richard


 
  • Patent:CH28549 15.05.1904 Hadrich, Richard (P), Lamertz, Franz (P), Dreckmann, Max (P) : Additionsmaschine
  • Patent:GB190318296 26.11.1903 Hädrich, Richard, Dreckmann, Max (P) und Lamertz, Franz (P) : Improvements in Adding Machines

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