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| 1959 | Representatives of seven workshops (one in Tokyo, five in Kyoto, and one in Osaka) that specialize in restoration of the National Treasures at that time got together and established the ACNT to improve their restoration techniques, as well as to start associated business | |
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| 1960 | Granted with the Organization Award from the National Commission for Protection of Cultural Properties | |
| 1967 | Participated in "Repairing and Conserving Painting of the East Asia" co-hosted by the UNESCO and the International Council of Museums (ICOM) | |
| Translated H.J. Plenderleith, "The Conservation of Antiquities and Works of Art-Treatment, Repair, and Restoration" (1956) | ||
| 1972 | Started co-development of electron-beam deteriorated silk for repairing silk-book cultural properties together with the Agency for Cultural Affairs, the National Research Institute for Cultural Properties and the Takasaki Advanced Radiation Research Institute in the Japan Atomic Energy Agency | |
| 1990 | Started cooperation for "Conservation and Restoration of Japanese Antiques in Foreign Countries" with the Agency for Cultural Affairs, the National Research Institute for Cultural Properties, Tokyo, and the Foundation for Cultural Heritage and Art Research | |
| 1995 | Received designation of the Selected Conservation Technique Conserving Organization by the Agency for Cultural Affairs | |
| Granted with the Special Awards from the Japan Foundation | ||
| Hosted the international symposium "Techniques for Conserving, Repairing and Restoring Japanese Arts" in Nara (The regular training workshops have been held every year since the next year) | ||
| 2000 | Granted with the Organization Award from the Minister of Education (The 50th anniversary of the Laws for Protection of Cultural Property) | |
| 2003 | Started operation of the restorer registration system and restorer certification system | |
| 2004 | Hosted the international symposium "International Symposium on the Present and the Future of Oriental Cultural Property Conservation" in Kyoto | |
| 2005 | Incorporated into and founded Limited Liability Intermediate Corporation | |
| Established the Kyushu Branch taking advantage of the opportunity of the establishment of the cultural property conservation and restoration facility in Kyushu National Museum | ||
| 2006 | Started providing technical assistance in the British Museum, England | |
| Hosted "The First International Symposium on Paper Conservation in East Asia" in Beijing, China | ||
| Started internship for restorers | ||
| 2007 | Established the Kansai Branch | |
| Started operating the supporting membership system | ||
| Co-hosted "The Second International Symposium on Paper Conservation in East Asia" in Dazaifu with Kyushu National Museum | ||
| 2008 | Hosted "The Third International Symposium on Paper Conservation in East Asia" in Seoul, Korea | |
| Started operating "Earnings Standard and Pension Plans for Restorers of ACNT" | ||
| Transferred to a general incorporated association due to abolishment of the Intermediate Corporation Law | ||
| 2009 | Established the Kanto Branch | |
| The 50th Anniversary of founding | ||
| 2010 | Hosted "The Fourth International Symposium on Paper Conservation in East Asia" in Lanzhou, China | |
| 2011 | Published "Soko-shi"(The history of mounting oriental paintings and calligraphies) | |
| 2012 | Co-hosted "The Fifth International Symposium on Paper Conservation in East Asia" in Dazaifu with Kyushu National Museum |