Telefunken logo. It also appears in red, and also as brown, red/orange segments and blue lettering.
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Telefunken is a German radio and television apparatus company, founded in Berlin in 1903, as a joint venture of Siemens & Halske and the Allgemeine Elektricitäts-Gesellschaft (General Electricity Company).
Brief overview 
The name "Telefunken" appears in:
- the product brand name "Telefunken";
- Gesellschaft für drahtlose Telegraphie m.b.H., System Telefunken, founded 1903 in Berlin as a subsidiary of AEG and Siemens & Halske;
- Telefunken, Gesellschaft für drahtlose Telegraphie m.b.H. (from 1923 to 1955 - since 1941 subsidiary of the AEG only);
- Telefunken GmbH in 1955;
- Telefunken Aktiengesellschaft (AG) in 1963;
- Merger of AEG and Telefunken to form Allgemeine Elektricitäts-Gesellschaft AEG-Telefunken (from 1967 to 1979);
- AEG-TELEFUNKEN AG (from 1979 to 1985);
- TELEFUNKEN Fernseh und Rundfunk GmbH, Hanover (1972, subsidiary of AEG-TELEFUNKEN);
- the company Telefunken USA in 2001, now "Telefunken Elektroakustik" (2009);
- the company "Telefunken Semiconductors GmbH & Co. KG" in Heilbronn Germany (since 2009);
- the company "Telefunken Lighting technologies S,L" (2009)
The company Telefunken USA was incorporated in early 2001 to provide restoration services and build reproductions of vintage Telefunken microphones.
Around the start of the 20th century, two groups of German researchers worked on the development of techniques for wireless communication. The one group at AEG, led by Adolf Slaby and Georg Graf von Arco, developed systems for the German Navy; the other one, under Karl Ferdinand Braun, at Siemens, for the German Army. Their main competitor was the British Marconi Company.
When a dispute concerning patents arose between the two companies, Kaiser Wilhelm II urged both parties to join efforts, creating Gesellschaft für drahtlose Telegraphie System Telefunken ("The Company for Wireless Telegraphy Ltd.") joint venture on 27 May 1903, with the disputed patents and techniques invested in it. On 17 April 1923, it was renamed Telefunken, The Company for Wireless Telegraphy. Telefunken was the company's telegraph address. The first technical director of Telefunken was Georg Graf von Arco.
Telefunken rapidly became a major player in the radio and electronics fields, both civilian and military. During World War I, they supplied radio sets and telegraphy equipment for the military, as well as building one of the first radio navigation systems for the Zeppelin force. The Telefunken Kompass Sender operated from 1908 to 1918, allowing the Zeppelins to navigate throughout the North Sea area in any weather.
Starting in 1923, Telefunken built broadcast transmitters and radio sets. In 1928, Telefunken made history by designing the V-41 amplifier for the German Radio Network. This was the very first two stage, "Hi-Fi" amplifier. Over time, Telefunken perfected their designs and in 1950 the V-72 amplifier was developed. The TAB (a manufacturing subcontractor to Telefunken) V-72 soon became popular with other radio stations and recording facilities. The V-72S was the only type of amplifier found in the REDD.37 console used by the Beatles at Abbey Road Studios on many of their early recordings. In 1932, record players were added to the product line.
In 1941, Siemens transferred its Telefunken shares to AEG as part of the agreements known as the "Telefunken settlement", and AEG thus became the sole owner and continued to lead Telefunken as a subsidiary (starting in 1955 as "Telefunken GmbH" and from 1963 as "Telefunken AG").
During the Second World War, Telefunken was a supplier of vacuum tubes, transmitters and radio relay systems, and developed radar facilities and directional finders, aiding extensively to the German air defence against British-American Aerial Bombing. During the war, manufacturing plants were shifted to and developed in west of Germany or relocated. Thus, Telefunken, under AEG, turned into the smaller subsidiary, with the three divisions realigning and data processing technology, elements as well as broadcast, television and phono. Telefunken was also the originator of the FM radio broadcast system. Telefunken, through the subsidiary company Teldec (a joint venture with Decca Records), was for many decades one of the largest German record companies, until Teldec was sold to WEA in 1988.
In 1959, Telefunken established a modern semiconductor works in Heilbronn, where in April 1960 production began. The works was expanded several times, and in 1970 a new 6-storey building was built at the northern edge of the area. At the beginning of the 1970s it housed approximately 2,500 employees.
In 1967, Telefunken was merged with AEG, which was then renamed to AEG-Telefunken. In the beginning of 1960s, Walter Bruch developed the PAL-colour television system for the company, in use by most countries of the western Hemisphere (except United States, Canada, Mexico and the western part of South America). PAL is established i.e. in the United Kingdom (PAL-I) and, except France, many other european countries - also in Brazil (PAL-M), Argentina (PAL-N), South Africa, India and Australia.
The mainframe computer TR 4 was developed at Telefunken in Backnang, and the TR 440 model was developed at Telefunken in Konstanz. They were in use at many German university computing centres from the 1970s to around 1985. The development and manufacture of large computers was separated in 1974 to the Konstanz Computer Company (CGK). The production of mini- and process computers was integrated into the automatic control engineering division of AEG. When AEG was bought by Daimler in 1985, "Telefunken" was dropped from the company name.
In 2005, Telefunken Sender Systeme Berlin changed its name to Transradio SenderSysteme Berlin AG. The name "Transradio" dates back to 1918, when Transradio was founded as a subsidiary of Telefunken. A year later, in 1919, Transradio made history by introducing duplex transmission. Transradio has specialized in research, development and design of modern AM, VHF/FM and DRM broadcasting systems.
In August 2006, it acquired the Turkish company Profilo Telra, one of the largest European manufacturers of TV-devices, with Telefunken GmbH granting a license for the Telefunken trademark rights and producing televisions under that name.
In 2000, Toni Roger Fishman acquired The Diamond Shaped Logo & The Telefunken Brand Name for use in North America. The company "Telefunken USA"  was incorporated in early 2001 to provide restoration services and build exact reproductions of vintage Telefunken microphones. In 2003, Telefunken USA won a TEC Award for Studio Microphone Technology for their exact reproduction of the original Ela M 250 / 251 Microphone system. Telefunken USA has since received several TEC Awards nominations for the following microphone systems: the Telefunken USA M12 or C12 (originally developed by AKG), the R-F-T M16 MkII, and the AK47. The Historic Telefunken Ela M251 microphone system entered the MIX foundation's Hall of fame in 2006. In 2008, Telefunken USA won a second TEC Award for its new Ela M 260 microphone.
As a result of a conference held in Frankfurt in May 2009, Telefunken USA has been renamed Telefunken Elektroakustik ("Electrical Acoustics") Division of Telefunken and awarded the exclusive rights to manufacture a wide variety of professional audio products and vacuum tubes bearing the Telefunken Trade Mark, in over 27 countries. Telefunken Elektroakustik now uses the Telefunken trademark for Professional Audio Equipment & Component Based Electronics, such as Capacitors, Transformers, Vacuum Tubes in Asia, Australia, Europe, North America and South America,
Business fields 
Telefunken produced an extensive product spectrum of devices and systems from 1903 to 1996. Common characteristics are the authority for high frequency and communications technology and the construction unit and infrastructure technology necessary for it. Among other things:
- Energy saving Lighting technology
- Analogue computer
- Voucher recognition, pattern recognition and letter sorting
- Data communications networks
- Digital computer for exchange technique, air traffic control, scientific, military applications
- Electrical elements
- Electro-acoustic plants and studio equipment
- Flight guidance systems
- Guidance and weapon deployment systems
- Radio and data communication for applications of military
- Radios for authority and operating radio
- Semiconductor, circuits, solar cells, infrared modules
- Mobile radio engineering
- Direction finder and detection
- Phono and tape decks, videodisc
- Power Tools
- Radar facilities for soil, flight and ship monitoring
- Radio and TV home receiver
- Vacuum Tubes
- Radio relay link and satellite technology
- Sending and receipt tubes, travelling field tubes, color image tubes
- Transmitter for broadcast and television, DAB transmitter
- Speech recognition
- Telephone, long-distance traffic, cable technology.
Locations and manufacturing plants 
Into the 1930s years, production was made after a distributor in the workshops of the two parent companies. The company headquarters was located in Berlin Kreuzberg, Hallesches Ufer 30 (1918–37).
Starting from 1938, manufacturing and developing plants were concentrated at the new headquarters (until 1945) in Berlin Zehlendorf, Goerzallee.
During the Second World War, there were further manufacturing plants in the Berlin area, in Thuringia, Saxonia, Moravia, Silesia, on Rügen. In addition, in Baltic countries at Tallinn and Riga, and in occupied areas of Poland at Krakau and Lodz, floats and works were established. The tube mill Lodz was shifted in 1944 with the staff from Ulm.
After the Second World War, new firm locations for development and production were established. The company headquarters was located first in Berlin-Schöneberg (1945–48), then in Berlin-Kreuzberg (1948–52), Berlin-Moabit (1952–60) and Berlin Charlottenburg (1960–67).
Production plants were located in:
- Backnang: Long-distance communications and cable technology (now Tesat-Spacecom)
- Berlin-Moabit, Sickingenstr. 20-26: Broadcast and television transmitters, mobile communications (now Transradio SenderSysteme Berlin AG)
- Berlin-Moabit, Sickingenstr. 71: Tubes (since 2005: JobCenter Berlin Mitte, Employment agency)
- Berlin-Wedding (current: Gesundbrunnen), Schwedenstr.: Broadcast sets, Phono and tape decks, Videocassette recorder, Videodisc player
- Celle: Color television sets (1966–1997, buildings 2001/2002 completely demolished
- Eiweiler: High-frequency engineering
- Hanover, Göttinger Chaussee 76: Broadcast and television sets, Acoustic engineering (til 1973)
- Heilbronn: Semiconductor, circuits, solar cells, infrared modules (now Telefunken Semiconductors GmbH & Co. KG)
- Konstanz: Computer technology, letter sorting systems, character recognition technology, air traffic control systems, Studio tape decks, cash dispensing machines
- Offenburg: Long-distance communications technology
- Osterode am Harz: Videocassette recorder
- Ulm, Danube valley: Television picture tubes
- Ulm, Elisabethenstrasse: Radar, Radiolocation, detection equipment, speech and radio data transmission systems, Research Centre (now Telefunken Racoms)
- Ulm, Söflinger Strasse: Tubes
- Wolfenbüttel: Electroacoustics (from 1973 on)
- Telefunken Elektroakustik,Factory Restoration Services
- Telefunken, Early Electronic TV Gallery, Early Television Foundation.
- M. Friedewald: Telefunken and the German ship radio 1903–1914. In: Magazine for enterprise history 46. No. 1, 2001, P. 27-57.
- M. Fox: George von Arco (1869–1940) - engineer, Pazifist, technical director von Telefunken. A Erfinderbiographie. Publishing house for history of the natural sciences and the technology, Berlin and Munich Diepholz, 2003.
- L. And Scholl: Marconi versus Telefunken: Drathlose telegraphy and their meaning for shipping. In: G. Bayerl, W. weber (Hrsg.): Social history of the technology. Ulrich Troitz to 60. Birthday. Waxmann, Münster 1997 (Cottbuser studies to the history of technology, work and environment, 7).
- Telefunken transmitter technology GmbH: 90 years Telefunken. Berlin, 1993.
- E. Thiele (Hrsg.): Telefunken after 100 years: The inheritance of a German world brand. Nicolai, Berlin, 2003.
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