Around Showa 25(1950) almost 200,000 old-fashioned No. 2 style wall-mounted telephones are still in use, relics of the days of the first conversion to automatic phone systems. These old phones have poor transmission characteristics and contain many outmoded component materials. In July 1953, a new model is introduced with transmission characteristics and quality equivalent to the No. 3 automatic telephone set. This model becomes known as the No. 23 automatic phone set, and is gradually replaced beginning around 1959.

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