1955-
1955
- Establishment of the Kyushu and Osaka sub-branch offices (currently the Seibu and Osaka branches, respectively)
1956
- Receives order for the first domestic antenna for TV broadcasting
- Receives order for the TV broadcasting antenna to be installed on the Tokyo Tower
1958
[ Completion of Tokyo Tower and the arrival of the television age ]
[ The number of telephone sets installed in Tokyo exceeds 500,000 ]
1960
- Building of the Kawagoe Plant (currently Kawagoe Office) and the start of radio tower and steel structure manufacturing
1961
- Receives first order of parabolic antenna for Nippon Telegraph and Telephone Public Corporation
- Manufacturing of automatic crankshaft hardening equipment
1963
- Establishment of the Nagoya sub-branch office (currently the Nagoya branch)
