German manufacturer Voith has been a customer of Deutsche Bank for more than a century. : FRANKFURT/LONDON: German manufacturer Voith has been a customer of Deutsche Bank for more than a century. But as the maker of hydropower and paper plants expands abroad it said it has started to hire other international banks where it would have previously considered Germany's largest lender. That could be bad news for Deutsche, which was founded in 1870 to help companies with overseas trade.