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B21 may refer to: * B21 (band), a bhangra group * B-21 (machine), a cypher machine invented by Boris Hagelin * B21 (New York City bus) serving Brooklyn * HLA-B21, an HLA - B serotype * 2D line beam element in Abaqus and also : * North American XB-21, an experimental bomber aircraft * Volvo Redblock Engine, an automotive engine ==References== 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「B21」の詳細全文を読む スポンサード リンク
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