Toshiba, or Toshiba Corporation is a Japanese multinational firm manufacturing consumer products, electronic devices and components along with its main business in infrastructure. Toshiba is the world's 5th largest PC manufacturer after HP, Dell, Acer, and Lenovo, Toshiba is a world leader when it comes to high technological advancements from electronic and electrical products to information & communication equipment and systems. Toshiba was started by the merging of two companies back in 1939 and called Tokyo Shibaura Denki it wasn't long before it was nicknamed Toshiba and was officially renamed in 1978 to Toshiba Corporation. Toshiba achieved the invention of Radar in 1942, microwave oven 1959, the colour video phone in 1971, laptop computer in 1986, DVD in 1995 and the failed HD DVD in 2005. Toshiba signed a contract agreement on joint environmental research in October 2007 in working to reduce car pollution and create efficient power systems that has not directly affect the environment.