De Guilleuma investigated a reference in a book published in 1609 by the Italian Girolamo Sirtori.
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2.
Two researchers, Cesare Sirtori and Guido Franceschini, found the protein and licensed it to Pharmacia .
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3.
In the book, Sirtori describes a meeting with an aged spectacle maker called Juan Roget in Gerona who he described as the real inventor of the telescope.