Beginning on March 31, 1898, the phonograph firm of Hernandez Brothers, 12 Gante Street, Mexico City, placed advertisements in the English-language MEXICAN HERALD which declared: "THE BETTINI MICROPHONE attachment, [the] wonderful invention of a wonderful age, when attached to an ordinary Phonograph, improves it to such an extent that the sound is unlike that of instruments thus far considered the best ... " The same broadside continued to be placed in that newspaper through August 18, 1898.