ATLANTA (March 2)—Japan´s Yokohama Rubber Co. Ltd. has joined RubberNetwork.com L.L.C., the global electronic purchasing and procurement marketplace. Yokohama is the seventh major tire maker to become a member of RubberNetwork.com, and helps the company prepare for the Asian launch of the marketplace, set for September. RubberNetwork plans to start live operation in North America in April, followed by a European launch in July. The seven members together represent more than $50 billion in annual purchases of raw materials, machinery, goods and services, the company said. The other members are Continental A.G., Cooper Tire & Rubber Co., Goodyear, Pirelli S.p.A., Groupe Michelin and Sumitomo Rubber Industries Ltd.