Raúl Pires Ferreira Chaves (27 May 1889 – 18 August 1967) was a Portuguese civil engineer and inventor. A graduate of the Instituto Superior Técnico of Lisbon, he lived and primarily worked in Portugal, Portuguese Cape Verde and Portuguese Guinea (now Guinea-Bissau).
He invented and patented the "Sistema e material MURUS",[1] a precursor to modern construction systems based on modular blocks, and a contribution to the evolution of the concept of prefabrication. He utilised these materials in many of his construction projects.
^Diário de Notícias Sábado, 10 June 1939, p. 1 (in Portuguese)
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