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For Future Invention The NTT HISTORY CENTER OF TECHNOLOGIES is an archive of historical assets mainly consisting of the NTT group companies' huge collection of technological artifacts to be handed down to generations in the twenty-first century. Since the start of telegram service in 1869, the telecommunications business in Japan has undergone significant changes, starting with the Ministry of Communication, which then became the Ministry of Telecommunications, Nippon Telegraph and Telephone Public Corporation, and finally, following privatization, the NTT group. A continuous stream of technological innovation has supported this history of Japanese telecommunications spanning over 100 years. The NTT HISTORY CENTER OF TECHNOLOGIES exhibits in timeline fashion a collection of historical assets of the NTT group, accumulated as the result of the group's development of telecommunications technologies with particular focus on the half-century since the foundation of the Nippon Telegraph and Telephone Public Corporation.