Brevet
Brevets Union soviétique 1988

- Patent:SU1392336 30.04.1988 Evgenij G. Volovik : Following device of planimeter
- Patent:SU1421978 07.09.1988 Maryan G. Petyukevich : Planimeter
![]() | RechnerlexikonDie große Enzyklopädie des mechanischen Rechnens |
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