The Great Kantō earthquake struck Japan in 1923. 140,000 people were killed and 3.4 million were left homeless. Four of NEC's factories were destroyed, killing 105 of NEC's engineers and workers. Thirteen of Tokyo's telephone offices were destroyed by fire. Telephone and telegraph service was interrupted by damage to telephone cables. In response, the Ministry of Communications accelerated major programs to install automatic telephone switching systems and enter radio broadcasting.[https://arxiv.org/pdf/1604.00148.pdf] The first automatic switching systems were the Strowger-type model made by Automatic Telephone Manufacturing Co. (ATM) in the United Kingdom. NEC participated in the installation of the automatic switching systems, ultimately becoming the general sales agent for ATM. NEC developed its own Strowger-type automatic switching system in 1924, a first in Japan. One of the plants almost leveled during the Kanto earthquake, the Mita Plant, was chosen to support expanding production. A new three-story steel-reinforced concrete building was built, starting in 1925. It was modeled after the Western Electric Hawthorne Works.