I Generation : 1909 Mr.. Alberto Olvera Hernandez began the construction of the first clock wich led to the first monumental clock making in Mexico and Latin America.
  II Generation: 1940, Enginner Roque Leonel Olvera Charolet, eldest son of Mr. Alberto is incorporated into the production of monumental clocks, thus giving impe tus to the monumental clock industry in Mexico and Zacatlán.  
III Generation: Jesus Clemente Olvera Trejo, son of Mr Roque Leonel Olvera, officially comes to work in the clock industry, taking the brand name Relojes Olvera III Generación .