Following Kyoto, the common-battery system was adopted in Tokyo, Osaka and part of Nagoya in the forty-second year of the Meiji Period(1909). By that time, deteriorating line insulation had been overcome by the development of enamel wires, and until 1922, one system after another was replaced by the common-battery system. No.2 common-battery telephone was the first domestic common-battery telephone.

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