A Huawei logo is seen on a device at a media event in London, Britain, February 18, 2020. REUTERS/Peter Nicholls/File Photo Acquire Licensing Rights TAIPEI, Oct 6 (Reuters) - Taiwan's government has opened an investigation into four companies named in a media report as conducting business with firms linked to U.S.-sanctioned Huawei (HWT.UL) in China, and is considering tighter rules on key technologies. Taiwan Economy Minister Wang Mei-hua said the ministry would be looking into whether the firms' activities in China "matched up" with their initial investment approval from the island's government. "If not, then the highest permitted fine is...