Sumitomo Electric Asia Ltd. (SEA), established in Hong Kong at 1977 as a 100% subsidiary of Sumitomo Electric Industries, Ltd. (SEI), represents its Network Products Sales & Marketing Unit and covers China and part of South-East Asia territories. SEA established its trading subsidiary, Sumiden Asia (Shenzhen) Co. Ltd. at 2008 with offices at Shenzhen, Beijing, Shanghai and Guangzhou.  Business portfolio of SEA includes electric wire/cable, optical fiber/cable, fusion splicer, lightwave and microwave devices, compound semi-conductors, fine polymer and hardmetal products.