Concurrent Computer Corp, of Tinton Falls, New Jersey has raised a bit of cash for itself by selling a 40% stake in MassComp Japan to Nippon Steel Corp, and the business will then be merged into the Concurrent Nippon Corp joint venture formed three years ago by Nippon Steel and the old Concurrent to market and distribute the US company’s real-time minicomputers, in which the steel firm already has a 40% stake.