Alexander Graham Bell and Thomas Edison-

In 1875, Alexander Graham Bell invented a machine to transmit the human voice over wires the

___________________________

The first telephone lines between cities went up in

___________________________

By 1880, more than

___________________________

of telephone wire connected

thousands of American homes and businesses

Thomas Alva Edison had more than

___________________________

for his ideas and inventions.

He invented the first

___________________________

and electrical generating

system in 1879.

He also invented the

___________________________

, a device made it possible to

record sound.

Edison also developed the kinescope, a camera

-like device that was the first

successful form of

___________________________

.