Siemens AG is Europe's largest engineering conglomerate. Siemens' international headquarters are located in Berlin and Munich, Germany. The company is a conglomerate of three main business sectors: Industry, Energy and Healthcare with a total of 15 Divisions.

Worldwide, Siemens and its subsidiaries employ approximately 480,000 people in nearly 190 countries and reported global revenue of €72.448 billion in fiscal year 2007. Siemens AG is listed on the Frankfurt Stock Exchange, and has been listed on the New York Stock Exchange since March 12, 2001.

History

Siemens 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.

In 1848, the company built the first long-distance telegraph line in Europe; 500 km from Berlin to Frankfurt am Main. In 1850 the founder's younger brother, Sir William Siemens (born Carl Wilhelm Siemens), started to represent the company in London. In the 1850s, the company was involved in building long distance telegraph networks in Russia. In 1855, a company branch headed by another brother, Carl von Siemens, opened in St Petersburg, Russia. In 1867, Siemens completed the monumental Indo-European (Calcutta to London) telegraph line.

In 1881, a Siemens AC Alternator driven by a watermill was used to power the world's first electric street lighting in the town of Godalming, United Kingdom. The company continued to grow and diversified into electric trains and light bulbs. In 1890, the founder retired and left the company to his brother Carl and sons Arnold and Wilhelm. Siemens & Halske (S&H) was incorporated in 1897.

In 1919, S&H and two other companies jointly formed the Osram lightbulb company. A Japanese subsidiary was established in 1923.

During the 1920s and 1930s, S&H started to manufacture radios, television sets, and electron microscopes.

Ardnacrusha hydro power station

In the 1930s Siemens constructed the Ardnacrusha Hydro Power station on the River Shannon in the then Irish Free State, and it was a world first for its design. The company is remembered for its desire to raise the wages of its under-paid workers only to be overruled by the Cumann na nGaedhael government.

World War II era

Preceding World War II Siemens was involved in the secret rearmament of Germany. During the Second World War, Siemens supported the Hitler regime, contributed to the war effort and participated in the "Nazification" of the economy. Siemens had many factories in and around notorious extermination camps such as Auschwitz and used slave labor from concentration camps to build electric switches for military uses. In one example, almost 100,000 men and women from Auschwitz worked in a Siemens factory inside the camp, supplying the electricity to the camp.. The Crematorium ovens at Buchenwald still bear the Siemens name .