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Radio telephone
To trans fer sound to a radio for comunacation -
Marine vhf radio
Allowed people to phone a ship in the middle of the sea -
Period: to
THE TELEPHONE
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Walkie talkie
A motor roller invented a back pack -
Mobile telephonesystem
A call set-up required a manual operation by a mobile operator -
Rotary Dial
Networked by a MTA
(mobile Telephone system A) -
Cellular network
To spread connections over the nations -
Dual-tone multi-frequency signaling (DTMF)
16 keys with difernt tones for each number -
Improved telephone service
Automatic public telephone network -
acoustic coupler
A wireless phone signalled by an acoustic coupler -
Handheld cell phone
A phone installed in cars that are able to receive calls while traveling