Descrizione delle macchine e procedimenti per cui vennero accordati attestati di privativa ...

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Item Link Original Source
Full view   v.1-3 1855-1857 University of Michigan
Full view   v.4-6 1858-1860 University of Michigan
Full view   no.13 1861 University of Michigan
Full view   no.14 1862 University of Michigan
Full view   no.15 1862 University of Michigan