Ratan Tata, an iconic corporate leader, retired as chairman of Tata group on Friday after a 50-year run at the helm of one of country's oldest business empires.  Tata, who turned 75 on Friday, is in Pune for his birthday, sources at Bombay House, headquarters of the salt-to-software conglomerate. Chairman-designate Cyrus Mistry, who made a visit to Bombay House yesterday, will take charge of the new assignment on Saturday, sources in Tata Sons said. Reference: Tata Group, an Indian multinational company conglomerate headquartered in Mumbai, includes 98 companies (289,500 employees) on six continents. They cover areas such as automotive, aerospace industry, software, and a number of other areas, including the coffee and tea manufacturing (Tata Coffee and Tata Tea Limited). According to estimates for 2012, the approximate total annual turnover of Tata Group is 28.8 billion dolla Source:timesofindia.indiatimes.com/business/india-business/Ratan-Tata-retires-today/articleshow/17793950.cms