sentences:  Over the years Rudolf Wolff & Co became one of the leading brokers and Ring dealing member of the London Metal Exchange and members of the Company have played a very active role in the organization and running of the Exchange.In 1982, Rudolf Wolff & Co. Ltd. became a wholly owned subsidiary of Noranda.In the 1990s Rudolf Wolff dealt in a range of over 150 commodity futures and options, covering metals, agricultural commodities, energy, currencies, financial instruments and stock indices, trading on more than 20 international exchanges.