In 1973, Martin Cooper invented the first cell phone. As at the beginning were so big and expensive, they were only used by the military and some companies. By 1983 were smaller and economical and could be used by the general public. How the cell phone? The cell phone works through the union of a network of stations transmitting-receiving radio calls towers (base station, which consists of a tower, in a small building where the radio equipment) and a set of telephone exchanges. The concept of cellular system, designed by Bell Labs in 1947, consists of a network of small transmitting towers, each tower located in a "cell" or "zone" with a radius of a few miles. Each tower a few of the frequencies designated to the system. In what a cell travels through the cells, the so-called pass tower tower, making it possible communication between mobile phones or between mobile phones to fixed network. Recommendations For the better functioning of this type of electric devices we recommend not expose them to heat or humendad

Usually National: Bush is being held at the date of November 18 and is ignited pyrotechnic and is celebrated on the day of rawel which is the patron of ls marabinos and that more is done to drink and go to the sunrise bagpipe players Usually in international: In india is celebrated on the day of the dead and celebrates sevan and all family members to spend the day with ladies suceres

The perfect vacation for me
The first thing you need is a passport and much, but a lot of money, then I level in the plane and I speak to miami shopping in 5 days I will lugo 5 days to puerto rico dancing and ended in rio de janeiro with garotas and garotos dancing samba....