DUO_410_TTK_01_COPY.png https://tiedemuseo.jyu.fi/en/collections/cultural-history-collections/items-1/duo_410_ttk_01_copy.png/view https://tiedemuseo.jyu.fi/@@site-logo/logo.png DUO_410_TTK_01_COPY.png Click to view full-size image… Size: 437KB