German multilevel electrical engineering/electronics company with over 440 000 employees in over 190 countries.
Over 150 years in business...
Approx. 1 000 000 products!
Second biggest mobile phone manufacturer after Nokia with Motorola.

Also on the top of development of GPRS and UMTS.

Siemens' hedquarters is located at München Germany.

It's a little known fact, but Siemens used to produce all mobile phones for Sony up to the Sony CMD Zx models. So they had plenty of experience prior to coming up with their own range of cellphones - they were the first to bring out a shock/dust/water proof phone, the M35 model. Some of their phones also feature color screens, WAP, and with the addition of S42 to the range will also feature an MP3 player. Cool.

Siemens is the official SI unit measuring the electric conductance of a material. For all practical purposes, conductance is the reciprocal of resistance, that is:

Conductance = 1/Resistance

The siemens (abbreviated S; not to be confused with the lower-case s for seconds), can be expressed in SI base units as:

S = m-2·kg-1·s3·A2

Of course, realizing that the siemens is the reciprocal of the ohm would give you the much simpler formula derived from Ohm's Law:

S = A/V

It is interesting to point out that the siemens used to be known as the mho (ohm spelled backwards) up until 1971, when the new name was adopted at the 14th Conférence Générale des Poids et Mesures, in the middle of a move to rename units after dead, important people in the field (in this case, Werner von Siemens).

Many of you who have casually taken physics or maybe even entry-level electrical engineering may not have heard of this unit. It really isn't one of the more important ones (it IS a reciprocal, after all). Plus, no teacher would want to be caught mouthing "That's a lot of siemens!" or "40 megasiemens!" Right.

Siemens AG corporate history

• 1847 October 12th: Werner von Siemens and his colleague Johann Georg Halske found the "Telegraphen-Bauanstalt von Siemens und Halske" to market the first viable needle telegraph.
• 1848 S&H build Europe's first telegraph line from Frankfurt/Main (where the revolutionary Paulskirche Parliament resides at the time) to Berlin.
• 1850 Wilhelm Siemens, W. v. Siemens' younger brother, takes over the S&H agency in London
• 1853 S&H begin building the Russian telegraph network
• 1855 creation of the Russian Siemens subsidiary, led by Carl von Siemens
• 1856 W. v. Siemens develops the double-T armature
• 1863 first Siemens cable factory in Woolwich
• 1866 W. v. Siemens discovers dynamoelectricity and invents the dynamo
• 1870 Siemens-built telegraph line from London to Calicut opens
• 1874 Siemens cable layer "Faraday" lays a transatlantic cable from Ireland to the U.S.
• 1879 Siemens demonstrate the world's first electric train
• 1881 Siemens build the world's first electric tramway in Berlin-Lichterfelde
• 1890 W. v. Siemens' brother Carl and his sons Wilhelm and Arnold take over the company, which is transformed into a KG
• 1896 Siemens build their first underground railway in Budapest
• 1897 Siemens goes public as Siemens & Halske Aktiengesellschaft
• 1903 Siemens-Schuckertwerke GmbH is founded
• 1905 serial production of tantal-wire lightbulbs begins
• 1908 Siemens-Schuckertwerke goes into the automobile business by acquiring Protos-Automobile GmbH
• 1919 Carl Friedrich von Siemens takes over the company; Siemens&Halske take part in the Osram GmbH KG joint venture
• 1921 Siemens complete the long-distance telephone line Berlin-Cologne, first of its kind in Europe
• 1923 Japanese Siemens subsidiary Fusi Denki Seizo KK is founded in Tokyo
• 1925 Siemens leads the Shannon Project (electrification of the Irish Republic)
• 1926 Siemens builds first German traffic light
• 1935 Siemens/AEG joint venture Telefunken develops Germany's first serial-built television set
• 1939 Siemens & Halske AG acquires all Siemens-Schuckertwerke stock
• 1941 Hermann von Siemens takes over the company
• 1944 Siemens develops the first 6 MeV betatron
• 1954 Siemens goes into the DP business
• 1958 Swedish subsidiary Siemens-Elema develops the world's first pacer
• 1962 Siemens builds Germany's (i.e. Deutsche Bundespost's) first electronically controlled telephone exchange
• 1966 Siemens AG is founded
• 1969 Kraftwerke Union (KWU) and Turbinen Union (TU) are founded
• 1973 Siemens begins producing LSI ICs
• 1978 Siemens makes the generators for the world's then-largest hydroelectric power plant in Itaipú, Brazil
• 1990 Siemens takes over Nixdorf; foundation of Siemens-Nixdorf Informationssysteme AG
• 1997 Siemens develops the first GSM mobile phone with a colour LCD
• 2001 March 12th: trading of Siemens stock at NYSE begins with ringing of the opening bell

Source: Siemens official website