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The Serono Trocello was an Italian navy-issued gas mask produced in 1915 by the chemical engeneer Cesare Serono (1871-1952) and his assistant Trocello.
The mask was almost identical to the army model, the "Camician-Pesci" type. It was made with various layers of gauze inside of which there was a layer of cotton that was replaceable. Some sources claim it to be a direct derivative of the Camician-Pesci type, while others claim that it was developed indipendently.