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Die große Enzyklopädie des mechanischen Rechnens

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Patents  France  2002

 
  • Patent:FR2803074 08.03.2002 Millet, Michel : Calendrier perpétuel
  • Patent:FR2823582 18.10.2002 Tollitte Francois Goerges : Device for reciprocal conversion between two currencies using a given factor, by use of a small card with a Slide Rule type scale and cursor

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