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Calderan is typically Venetian, of the area that includes the provinces of Venice, Treviso and Pordenone, Calderani, very rare, it is instead Tuscan, of Pisa, of Ponsacco, Calderano, very rare, is specific to Maratea in the area of Potenza, they should all derive from the craft of calderano, that is of master craftsman involved in the boiling and treatment of silkworms, probable occupation of the progenitor.
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