Joban Kosan Co., Ltd., founded in 1944 and based in Iwaki, Japan, is a diversified company with operations spanning tourism, commerce, manufacturing, and transportation sectors, serving both Japanese and international clientele. Its hospitality division is notably responsible for managing the popular Spa Resort Hawaiians complex, which includes a leisure resort and an adjoining golf course. Through its extensive trading arm, the company acts as a major wholesaler for a variety of goods, encompassing imported coal, a broad spectrum of petroleum products (such as heavy oil, LP gas, kerosene, gasoline, light oil, lubricants, and petrochemicals), wood pellets, and crucial construction materials like cement and ready-mixed concrete. Furthermore, Joban Kosan manufactures cast iron items, specializing in critical components like hydrostar motors used in marine equipment and industrial machinery, as well as hydraulic motor bodies. Complementing these activities, the firm also offers cargo transportation services.