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.
computer hardware manufacturer and distributor Dell, Incorporated is a  computer hardware manufacturer and distributor. The company is one of the world's largest computer distributors in terms of both quantity of units sold and gross income, and one of the United States' largest corporations. From 1999 until 2006 Dell delivered more complete computer systems worldwide per quarter than any other PC manufacturer.