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Die große Enzyklopädie des mechanischen Rechnens

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Patents  Sovjet Union  1990

 
  • Patent:SU1557461 15.04.1990 Anatolij Ya. Shenfeld Valentina A. Kandrikina Le Polt I IM M I Kalinina : Planimeter
  • Patent:SU1573334 23.06.1990 Sergej Yu. Danilov : Planimeter
  • Patent:SU1597618 07.10.1990 Igor P. Deshko Konstantin V. Molchanov MO I Radiotech : Digital planimeter
  • Patent:SU1613845 15.12.1990 Maryan G. Petyukevich : Planimeter

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