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Contra-rotating propellers
[fa] ملخهای متقاطع-دوار
[fr] Hélices contrarotatives
[it] Elica controrotante
[ja] 2重反転プロペラ
[nl] Contraroterende schroef
[pl] Śmigła przeciwbieżne
[sl] Kontrarotirajoča propelerja
[sv] Kontraroterande propeller
[zh] 同轴反转螺旋桨