Jisho

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Noun
1. radio clock
Wikipedia definition
2. Radio clockA radio clock or radio-controlled clock is a clock that is synchronized by a time code bit stream transmitted by a radio transmitter connected to a time standard such as an atomic clock. Such a clock may be synchronized to the time sent by a single transmitter, such as many national or regional time transmitters, or may use multiple transmitters, like the Global Positioning System.
Read “Radio clock” on English Wikipedia
Read “電波時計” on Japanese Wikipedia
Read “Radio clock” on DBpedia

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