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original: "Stampato in Roma coi tipi dell' Unione Cooperativa Editrice." In this context, "types" refers to the physical metal letter molds used in the printing press.
Milan was a major center for industrial and typographic innovation in late 19th-century Italy.
The "Tipografia del Senato" was the official printing establishment for the Italian Senate. Its involvement suggests that this edition of Leonardo's work was considered a project of significant national and cultural importance.