Explanation:

Tata Iron and Steel Company (TISCO) was founded by Jamsetji Tata and established by Dorabji Tata on 26 August 1907. TISCO started pig iron production in 1911 and began producing steel in 1912 as a branch of Jamsetji's Tata Group. The first steel ingot was manufactured on 16 February 1912. During the First World War (1914-1918), the company made rapid progress. By 1939, it operated the largest steel plant in the British Empire. The company launched a major modernization and expansion program in 1951. Later, in 1958, the program was upgraded to 2 million metric tonnes per annum (MTPA) project.By 1970, the company employed around 40,000 people at Jamshedpur, and a further 20,000 in the neighbouring coal mines. In 1971 and 1979, there were unsuccessful attempts to nationalise the company. In 1990, the company began to expand, and established its subsidiary, Tata Inc., in New York. The company changed its name from TISCO to Tata Steel Ltd. in 2005.