21cm線 (Japanese Wikipedia)

Analysis of information sources in references of the Wikipedia article "21cm線" in Japanese language version.

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“Radio Regulation ARTICLE I, CHAPTER II - Frequencies”. 国際電気通信連合. 2022年10月17日閲覧。 “5.340 All emissions are prohibited in the following bands: 1 400-1 427 MHz, （以下略）”