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An Invention (0)

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Dear classmates, I’m going to talk about a mobile phone invention
Mobile phones have brought about a dramatic change to the communication industry. The development of mobile phones has made long- distance communication a matter of seconds. The mobile phone was invented in 1973 by Dr. Martin Cooper, a Motorola employee. On April 3, 1973, the first cell phone call was made. The caller was naturally, Dr. Cooper himself .
Prior to the development of mobile phones, people used two-way radios to communicate while they were mobile. The idea behind two-way radios gave rise to the invention of mobile phones. During the 1940s, Motorola came up with the Walkie-Talkie followed by handheld two-way radios that operated on battery power .
In 1947, Douglas Ring and W. Rae Young at Bell Labs introduced the idea of hexagonal cells for mobile phones.
Ericsson came up with an automatic mobile phone system, which was released in Sweden in 1956. The drawback of this system was that the phones weighed 40 kg´s. Till 1970, mobile phones had to remain within their cell area and there were no means to continue communication while switching between cell areas . The call handoff system that allows users to move through different cell areas came up only in 1970.
Mobile phones are nowadays almost in every people hands . They are irreplaceable communication device .
Thanks for your attention .
An Invention #1
Punktid 50 punkti Autor soovib selle materjali allalaadimise eest saada 50 punkti.
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Aeg2009-04-13 Kuupäev, millal dokument üles laeti
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Autor Eliise Vilepill Õppematerjali autor

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