Ryoko 　Kenzai Co., Ltd./Takamatsu Office 502-13 Ota Kamimachi , Takamatsu City, Kagawa Prefecture　761-8074 MAP TEL.087 (866) 5283 Representative / FAX.087 (867) 2243 Updated: November 20, 2015 Home | Company Profile | guidance of Business line | premium concrete guidance | Contact Us copyright (c) 2014 ryoukou construction materials corporation All rights reserved.