• 1891

  • 1930

    Ing. Eustaquio Ibarra
    was his assistant
  • 1938

    Ing. Ruben Torres
    was his assistant
  • 1974

    Ing. Jorge Luis Rodríguez
    was his assistant
  • 1994

  • 2010

    Ing. Roberto Ladrón de Guevara
    was his assistant