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Die große Enzyklopädie des mechanischen Rechnens

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Patents  Poland  1924

 
  • Patent:PL232 30.05.1924 Krems, Otto (P) : Suwak do obliczania procentów i t. p.
  • Patent:PL233 30.05.1924 Krems, Otto (P) : Suwak do obliczania procentów i t. p.

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