The telephone

The telephone is a telecommunications device that transmit and receive sounds. Developed in the mid-1870s by Alexander Graham Bell, the telephone has long been considered indispensable to businesses, households and governments, is now one of the most common appliances in the developed world

All telephone have a microphone, to speak into and it reproduced the voice of the other person, a keypad to enter the number of the telephone to be called, and a landline telephone is connected by a pair of wires, to transmit the current ( only the old thelephone ) .

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