This distinction started around 1906 with the invention by Lee De Forest of the triode, which made electrical amplification of weak radio signals and audio signals possible with a non-mechanical device.. 
jẹ́ Ọba ilé Fráǹsì tẹ́lẹ̀.ìtọ́kasí oríìbí̀ ní àwọn ọlọ́pọ̀ ní àwọn Ọba ilé Fráǹsì.. 