OBI, a unit of Europe's Tengelmann Group, pulled out of China, saying it had sold its 13 mainland stores to Kingfisher, parent of B&Q, China's leading home improvement player, the South China Morning Post reported. The pull-out follows a dispute with OBI's joint venture partner and advances B&Q's plans to have a 50-store mainland network within 12 months. Home improvement is a big business in China, where new apartments are commonly sold as concrete shells requiring floor to ceiling fit-out.