He served as auxiliary bishop of Buenos Aires from 1948 till 1961, when he became bishop of Santiago del Estero.
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On November 12, 1948, he was appointed auxiliary bishop of Buenos Aires and titular bishop of Aulon.
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Tato received his episcopal consecration on March 27, 1949 from Santiago Luis Cardinal Copello, archbishop of Buenos Aires, with the archbishop of Santa Fe, Nicolás Fasolino, who would later become a cardinal, and the auxiliary bishop of Buenos Aires, Antonio Rocca, serving as co-consecrators.
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