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Ramón S. Castillo Barrionuevo (20 November 1873 - 1944) was President of Argentina from 28 June 1942 to 4 June 1943. He was previously acting president from 12 August 1940 to 27 June 1942.
Preceded by: Roberto María Ortiz | President of Argentina 1942–1943 | Succeeded by: Pedro Pablo Ramírez |