These are internal documents such as the articles of incorporation and meeting minutes of Kotsu Shoji Co., Ltd., established on December 19, 1947, with railway officials and businesspeople such as Kiyohide Suzuki, Kaichiro Nezu, and Shoshiro Kumano as initiators. The documents include those that have been stored for a long time and show signs of aging, such as stains, folds, and tears. The business of Kotsu Shoji Co., Ltd. involved the purchase, sale, import, and export of railway supplies for local railway companies, with many local railway companies as shareholders.