It is the problem how to maintain an analog transmission machine efficiency well during the simultaneous broadcasting period until 2010 when the analog broadcasting ends with digital broadcasting begun or that it is difficult how it should do the renewal plan of the end analog transmission machine from now. This time, to solve this problem, it did each broadcasting business person and the transmission machine maker, it examined questionnaire investigation about the lifetime and the prolonging life plan of the transmission machine and it examined about maintenance of the analog transmission machine and the renewal time.
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