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flachdruckverfahren of lithographischem stone, metal, etc., and the drawing umdruck) supporting plate by treatment with a non aetzenden means against the inclusion of color on the drawing vacancies should be protected
flachdruckverfahren of lithographischem stone, metal, etc., and the drawing umdruck) supporting plate by treatment with a non aetzenden means against the inclusion of color on the drawing vacancies should be protected