After 1934, the engineer Ricardo Esquível Teixeira Duarte resumed his initial plan, based on the specialisation in hydrogeology and geotechnics, including geological soundings, research and water catchment, foundations and hydraulic and underground works, constituting, the "Empresa de Sondagens e Fundações, Lda.", with headquarters at Rua Augusta 280, 4º, in Lisbon, offices of the engineer Ricardo Esquível Teixeira Duarte since 1929.
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