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X21 may refer to: *Northrop X-21, experimental aircraft designed to test wings with laminar flow control *SA-X-21 or S-400 (missile), anti-aircraft weapon system developed by Russia's Almaz Central Design Bureau as an upgrade of the S-300 family *X.21 (sometimes referred to as X21), an interface specification for differential communications introduced in the mid-1970s by the ITU-T *X21 (band) (次世代ユニット), a Japanese girl idol group de:X.21 fr:X21 fr:X.21 it:X21 it:X.21 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「X21 (disambiguation)」の詳細全文を読む スポンサード リンク
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