In March, 1962, Tokyo's Akishima Office begins commercial testing of the Model 600 telephone set, considered the highest attainment of voice communications capability and economy. After further commercial testing on a nationwide scale, the Model 600 phone begins full-scale service in 1963. Three colored models, white, gray and green, are introduced in 1971. Nearly a full century after the first Japanese-built telephone in Meiji 11 (1878), the nation achieves a general purpose telephone set with virtually flawless conversation capabilities.

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