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Maszyna liczca Staffla. Abraham Izrael Staffel Gears has been placed in locked walnut case The machine was able to add substract and convert between zotys and rubles Exhibit of the Warsaw Museum of Technology Muzeum Techniki pl Najstarsza istniejca polska machina liczca zbudowana przez Abrahama Izraela Staffla Koa zbate byy umieszczone