1 From the secondhand account, the reader gets more background information about what the Oregon Trail was. 2  From the firsthand account, the reader gets a better understanding why it was so dangerous.
Printers generally age more by the number of pages printed rather than by pure years. The rule of thumb has always been whatever the recommended volume is (for instance 5000 pages per month for a P3005) multiplied by say five or six years so about 300,000 pages would be the life expectancy of the printer.
Types of Printers. Since the invention of the printing technology, a variety of technologies have been employed in computer printers. Broadly printers are categorized as impact and non impact printers. Impact printers are the type of printers in which a key strikes the paper to make a letter. The examples of Impact printers are Daisy wheel and Dot matrix printers. While non-impact printers do not operate by striking a head against a ribbon. Inkjet printers and laser printers are the non-impact printers.