Core Viewpoint - Epson companies have filed a complaint with the U.S. International Trade Commission, alleging that certain ink cartridges and components imported and sold in the U.S. violate Section 337 of the Tariff Act of 1930 [1]. Group 1: Companies Involved - The complaint was filed by Epson Portland Inc., Epson America, Inc., and Seiko Epson Corporation [1]. - A list of defendants includes multiple companies from China and Hong Kong, such as Dongguan Ocbestjet Digital Technology Co., Ltd., Shenzhen Hongxinyuan ECommerce Co., Ltd., and Zhuhai Zhenyang Electronics Co., Ltd. [2]. Group 2: Legal Context - The complaint is based on Section 337 of the Tariff Act of 1930, which addresses unfair practices in import trade [1]. - The focus is on specific ink cartridges and their components that are allegedly infringing on U.S. trade laws [1].