Hyundai Mipo Dockyard Co., a South Korean shipbuilder, said Tuesday it inked a deal worth 348.3 billion won (US$330.5 million) to build 10 petrochemical product carriers for a shipping company in the Marshall Islands. Hyundai Mipo, a subsidiary of Hyundai Heavy Industries Co., said it will start building the vessels on May 7 but did not say when they will be delivered