Siemens AG is a German engineering conglomerate, the largest of its kind in Europe. Siemens has international headquarters located in Berlin, Munich and Erlangen. The company has three main business sectors: Industry, Energy, and Healthcare; with a total of 15 divisions. Siemens & Halske was founded by Werner von Siemens on 12 October 1847. Based on the telegraph, his invention used a needle to point to the sequence of letters, instead of using Morse code. The company, then called Telegraphen-Bauanstalt von Siemens & Halske, opened its first workshop on October 12.
Worldwide Siemens and its subsidiaries employ approximately 420,800 people in nearly 190 countries and reported global revenue of 76.651 billion euros for the year of 2009. Siemens AG is listed on the Frankfurt Stock Exchange, and has been listed on the New York Stock Exchange since March 12, 2001.