Jewna Jakobson

Jewna Jakobson lived in the 18-th century in the town of Nieswiez (or Nieswierz) on the territory of former Poland, then Russia, and now Belorus (Nesvizh or Nyasvizh). Nothing is known about the life of Jakobson, except that he was a clockmaker and mechanic. Nieswiez was since 1533 owned by the Polish magnates’ family Radziwill, and in the 18-th century was the residence of Michal Radziwill, who valued culture, arts and science and was known from fostering inventors and collected a significant amount of artifacts and an extraordinary library.

Invented a mechanical calculating machine, probably before 1770.

http://chc60.fgcu.edu/EN/HistoryDetail.aspx?c=13
http://history-computer.com/MechanicalCalculators/18thCentury/Jacobson.html

See also: Computing_and_cybernetics_in_CEE#Poland