TOKYO — As it begins its 125th year in business, Nippon Flour Mills Co. Ltd., which began operations in 1896 as Japan’s first modern-equipped flour milling company, is rebranding itself. To more accurately reflect its diversification into the production of food ingredients and health care products, the Tokyo-based company on Jan. 1 officially changed its name to NIPPN. “The change of our company name takes place for the first time since our founding, and we consider it as a refreshed startup that will make us . . .