Alexander Graham Bell believed one day machines would be invented to help deaf people hear and speak.
VOA: special.2010.05.14
The Philadelphia exhibition also included Alexander Graham Bell's telephone, Heinz ketchup and the Remington typewriter.
VOA: special.2011.08.01
That moment is famous. Alexander Graham Bell was in one room.
VOA: special.2010.05.14
应用推荐