find the enswers

who was "alexander graham bell" what a did he invent?
He was Scientist and he Invented Telephon.
Who was"Lavis Braille"and What did he invent?
He was a French linguist and he invented Reading for Blind.
Who was "Guglileno Marconi"and what did he invent.
He was Inventor and what did invent comunication Thelegraphic.