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coupler knuckle pin /ˈkʌplə ˈnʌkəl ˈpɪn/ n

中文：钩舌销

中文 · 钩舌销Español · pivote de la rótulaFrançais · axe d’attelage
Meaning：Part around which the coupler knuckle pivots to open and uncouple.
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Automatic coupler

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