sentences:  Tinfos AS was sold 15 April 2008 to the French-based manganese company Eramet.In 2009, Eramet sold the international unit of Tinfos to Holta Invest AS, a Norwegian investment company.Tinfos Jernverk produces silicomanganese, an alloy used for all steel.The company is the world leader in the production of low carbon silicomanganese for primarily stainless steel.