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Research on television broadcasting begins in various countries in the 1920s. In 1927 Japan's Takayanagi Kenjiro succeeds in producing the Japanese letter "I" on a television receiving tube, and expectations for television broadcasting immediately boom. In 1935, a TV phone combining television and telephone operations is created by Sone Tamotsu in the laboratories of the Ministry of Communications. The outbreak of World War II, however, interrupts research efforts and all communications fall under military controls.
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