Yes but we're talking about the century in which the technology had an impact, not the century in which it was invented. The telephone is a 19th century inventi

Yes but we're talking about the century in which the technology had an impact, not the century in which it was invented. The telephone is a 19th century invention which is only reaching the majority of the world's population in the 21st. Likewise the bicycle was a 19th century invention that really hit home in the 20th.