'In 1880 he invented the photophone, a device that sent messages through the air on beams of light'
Alexander Graham Bell
TELEPHONE HISTORY: In 1880 he invented the photophone, a device that sent messages through the air on beams of light
In 1880 he invented the photophone, a device that sent messages through the air on beams of light
In 1880 he invented the photophone, a device that sent messages through the air on beams of light
TELEPHONE HISTORY
Alexander Graham Bell
TELEPHONE HISTORY