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Schiefertafel Wien um MV. Schiefertafel mit Holzrahmen und Rechenmaschine Wien um br sterreichisches Museum fr Volkskunde MVInv nr own own photograph Photo Andreas Praefcke Own work all rights released Public domain sterreichisches Museum fr Volkskunde Slates blackboards Abacus Blackboards in Austria Photos by User AndreasPraefcke