Worker demands brake Peugeot's Opel takeover

German carmaker Opel on Tuesday pushed back the first step in its takeover by France's Peugeot, after workers raised hurdles over the future of a prized research centre.Workers have blocked the firm's legal reorganisation, a vital first step in the merger process, local newspaper the Allgemeine Zeitung reported citing sources inside the firm.A source close to the employee representatives told AFP that there were still questions to be negotiated between workers and managers at Opel and American p