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Die große Enzyklopädie des mechanischen Rechnens

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Patents  Poland  1931

 
  • Patent:PL12991 27.01.1931 Brunsviga (P) - Maschinenwerke Grimme, Natalis & Co. AG : Mechaniczne urzadzenie napedne maszyn do rachowania
  • Patent:PL14255 29.07.1931 Gorczynski, Antoni Hubert (P) : Maszyna do liczenia

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