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Die große Enzyklopädie des mechanischen Rechnens

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Patents  Sovjet Union  1981

 
  • Patent:SU870996 07.10.1981 Valentin S. Durnev Nota O. Botvinik : Planimeter
  • Patent:SU872988 15.10.1981 Pavel I. Sidorenko Igor V. Plakhetko Inst Burovoi Tekhnik (SU) : Rotary planimeter

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