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Rechnerlexikon

Die große Enzyklopädie des mechanischen Rechnens

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Patents  Sovjet Union  1989

 
  • Patent:SU1460216 23.02.1989 Evgenij S. Yablokov : Deep-well cavern meter/planimeter
  • Patent:SU1525495 30.11.1989 Ramil V. Stepanov Bairak Z. Sultanov Ufimsk Neftyanoj Inst : Rotary planimeter

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