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モールス信号(符号)が簡単に覚えられるよ。一週間であなたも1アマ! アマチュア無線の試験用
モールス信号
January 27, 2021 at 03:41:11 GMT+9 * ·
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http://www91.sakura.ne.jp/~kay2/ham/morse.htm
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