Sumitomo Riko to Offer Seminar on Seismic Damper System for Wooden Houses on October 3, 2017 in Products Sumitomo Riko Co. Ltd. (TYO:5191) will host seminars on building earthquake-proof homes for construction companies in the two major cities…... Membership Required You must be a member to access this content.View Membership LevelsAlready a member? Log in here Continue Reading