This is a police telephone line diagram from March 1949, but it is no longer in use. It states "Osaka Police Regional Headquarters Communications Division." The "Osaka Police Regional Headquarters" was a regional organization of the National Rural Police that existed from 1948 to 1954, and the "Communications Division" also existed as part of its organization during that period. More than 30 sheets of paper are bound with thread. Size: Approximately 36 x 26 cm. There are signs of age-related deterioration such as dirt, folds, and tears. Due to deterioration, the ink is quite faded. Sheets 1-3 are stuck together at one point (photo 9). The item has not been cleaned, so dust and dirt are as is. The color of the actual item may appear slightly different from the photos due to screen lighting and color rendering environment. Please understand that this is a printed item over 75 years old before purchasing. It will be shipped folded in two (photo 10).