MILAN (Reuters) – Italy’s De Nora family will keep a controlling stake in their electrode-making company which aims to list next week while gas grid operator Snam will hold a “relevant” share, De Nora Industrie Chief Financial Officer Matteo Lodrini said. De Nora Industrie, founded in 1923, is seeking to raise 200 million euros ($210 million) in fresh cash through its initial public offering (IPO), which will value the company up to 371 million euros. Snam holds a 36% stake and De Nora brothers Federico and Michele hold a combined share of almost 64%, the IPO prospectus showed. Both shareholde…