In July of the twenty-ninth year of the Meiji Period (1896), it was decided to replace the Gower-Bell telephone with the Delville magnetic telephone, which was more sensitive. This telephone had a magnetic dynamo inside and since then, the name 'magnetic telephone' came to be used. The Delville magnetic telephone was used for ordinary subscribers until around 1965 because the transmitter mechanism was simple and easy to maintain. After the Sino-Japanese War, the demand for the telephone continued to increase and the number of subscribers, only 2,800 in 1879, reached 35,000 in 1904.

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