Diovan is commonly used to treat conditions related to the cardiovascular system, such as high blood pressure and congestive heart failure, and to help improve survival after a heart attack.
Telecommunications, or telecom, is the transmission of signals over long distances. It began with the invention of the telegraph in 1837, followed by the telephone in 1876. Radio broadcasts began the late 1800s and the first television broadcasts started in the early 1900s.
The term is often used in its plural form, telecommunications, because it involves many different technologies. Early means of communicating over a distance included visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags, and optical heliographs.