The Mitsubishi Group (三菱グループ Mitsubishi Gurūpu, also known as the Mitsubishi Group of Companies or Mitsubishi Companies, and informally as the Mitsubishi Keiretsu) is a group of autonomous Japanese multinational companies in a variety of industries. It is historically descended from the Mitsubishi zaibatsu, a unified company which existed from 1870 to 1947 and was disbanded during the occupation of Japan following World War II. The former constituents of the company continue to share the Mitsubishi brand and trademark. Although the group companies participate in limited business cooperation, they are formally independent and are not under common control. One of the companies from the group, Mitsubishi Pencil (三菱鉛筆), released several Rockman related stationery in the 1990s. Mitsubishi Pencil also released Rockman.EXE stationery in 2002.