Japan's Mitsubishi Materials Corp. announced on the 28th the group's final report on product data tampering. The tampering problem may have existed since around 1977. The Group's illegal product shipments are subject to duplicate removal of 762 companies. Mitsubishi Materials Corporation Director Takeuchi Takeshi And Chairman Yatohiro will return all monthly salary for three months starting in April. The deputy director and chief executive director will return 40% of the monthly salary for a period of 3 months. Yabeg is based on the revival of the management system. April 1st will be retired to consultant position.