1. To study the development of the use of communication tools within a year 2540 to the 2557
.Before the coming of age of the mobile phone and PC. In one era (about a year 2540). We used to communicate through the machine, pager, or also known as packet link in the official said a pager.The black clothing (first generation). To tremble every incoming message unit. When pressed, it will find text displayed on the screen for long, there are a variety of brands
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