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Handrechenmaschine Curta II DZM. Hamburg Deutsches Zollmuseumbr Handrechenmaschine Curta Typ II Nr Hersteller Contina AG Mauren Liechtenstein in Gebrauch der Bundeszollverwaltung in den erer Jahren DZM own own photograph Photo Andreas Praefcke Own work all rights released Public domain Collections of the Deutsches Zollmuseum