-
telephone
telephone transmission extends across and between major cities -
adds
Fleming invents the vacuum diode -
call
first telephone call -
systems
switching systems -
at&t
multiplexing concept -
ringer
first phone to combine ringer and handset -
transmisson
first commercial digital transmission -
first 911 call is made
in February 16 the first 911 call is made in Alabama -
first portable cellphone made
made by Martin cooper of motorola -
U.S military start using cell phone technology
start using fiber optics to improve communication -
public cell phone test
public test of new cellular tech -
voice over
the advent of voice over internet protocals -
100 million subscribers
a lot of people using phones now