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Mechanical Calculating Machine of Jewno Jacobson

 
  Je. Jacobson.
Mechanical summing 9-digit machine.
Nesvizh, Polish-Lithuanian Commonwealth, not later than 1770.
Brass, steel, gilding.
Length – 34.2 cm, width – 21.8 cm, height – 3.4 cm.
Museum registration number МЛ-00469