is a company, based in Milwaukee, Wisconsin, USA. It was founded in 1885 by professor Warren S. Johnson, inventor of the first electric room thermostat. It is a Fortune 500 diversified, multi-industrial company with 162, 000 employees in more than 1, 300 locations across six continents. Contents [hide] 1 Business Units 2 History 2.1 The Early Years 2.2 1950s-1980s 2.3 1990s 2.4 2000s 3 Acquisitions 4 Joint ventures 4.1 BLJC 4.2 MSKT 4.3 Amara Raja Batteries 4.4 JCS and Electric Vehicles 5 Closings 6 See also 7 References 8 External links [edit] Business Units Johnson Controls operates three business units: Automotive Experience, Building Efficiency and Power Solutions. [edit] History In 1883, Warren S. Johnson, a professor at the State Normal School in Whitewater, Wisconsin, received a patent for the first electric room thermostat. His invention helped launch the building control industry and was the impetus for a new company. Johnson and a group of Milwaukee investors incorporated the Johnson Electric Service Company in 1885 to manufacture, install and service automatic temperature regulation systems for buildings. The company was renamed Johnson Controls in 1974. Between 1885 and 1911, Professor Johnson delved into many other areas, including electric storage batteries, steam and gas powered automobiles, huge pneumatic clock towers and wireless telegraph communication. But at his death in 1911, the company decided to focus solely on its temperature control business for nonresidential buildings. Johnson Controls continued to develop new control technologies to help customers better manage their increasingly larger and more complex buildings. By the 1950s, for example, it was common for a large building to have hundreds of thermostats, valves, dampers and other temperature control devices installed throughout the facility, all of which had to be individually chec