In 1965 Giannattasio died in office shortly after attending in official capacity the funeral in London, England, of Winston Churchill.
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Among the prominent Uruguayan buildings for which Giannattassio's engineering company (Giannattasio & Berta, afterwards Ingeniería Civil) was responsible is the main building of The British Schools of Montevideo, Carrasco, opened 1964, as well as the main branch of Banco de la República, Av.
Jorge Luis Borges | Luis Miguel | Luis Buñuel | C.D. Luis Ángel Firpo | Tomás Luis de Victoria | San Luis Potosí | San Luis | San Luis Obispo, California | Luis Ángel Firpo | Luis | San Luis, Argentina | José Luis Rodríguez Zapatero | Luis Muñoz Marín | Luís Figo | Luis Suárez | Luis Muñoz Marín International Airport | Luis Fortuño | Luis Brandoni | Juan Luis Guerra | San Luis Potosí, San Luis Potosí | San Luis Obispo | Luis Manzano | Luís de Camões | José Luis Chilavert | The Bridge of San Luis Rey | San Luis Obispo County | Luis Fonsi | Luis Enrique | Luis Alandy | São Luís, Maranhão |
He was President of Uruguay 1965–1966, succeeding Luis Giannattasio who had died in office shortly after attending in official capacity the funeral of Winston Churchill.