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Die große Enzyklopädie des mechanischen Rechnens

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Patents  France  2000

 
  • Patent:FR2788149 07.07.2000 Jean Georges Kaspar : Procède de conversion et dispositif pour conversion
  • Patent:FR2788932 04.08.2000 Philippe Thoumie : Planner for watering of plants comprises pivoted disks with numbers indicating date of watering and date when next watering is required

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