”Hawker Sydley ” 應是 “Hawker Siddeley” 之 typo 錯誤

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"DN-121"  應是 “HS-121” 或 “DH-121” 之 typo 錯誤

Hawker Siddeley Trident - Wikipedia

Hawker Siddeley HS-121 Trident (originally the de Havilland DH.121 and the Airco DH.121)