Both these effects reduce the workload of the heart, so beta blockers are of value in treating the symptoms of angina pectoris, the chest pain brought on by narrowing of the coronary arteries that causes inadequate delivery of oxygen-rich blood to the heart muscle.
3 1. The invention and the history of the Dell computer is quite interesting. First of all, it was in 1984 when Michael Dell, a student at the University of Texas at Austin, created the company PC's Limited. He only had a starting capital of $1,000.
The company was so successful that within two years PC's Limited had distribution offices in Europe, and changed it's grammatically-incorrect name to Dell Computer Corporation. By 1991, seven years after selling it's first computer, Dell Computer Corporation was listed in the Fortune 500. With much experience in mail order telephone sales, Dell was one of the first companies to offer computers for mail order via the Internet.