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luffing derrick
meaning in English
俯仰式吊杆
俯仰式吊货杆
Related Words
luffing
luff
stay luff
luff tackle
luffing motor
luffing winch
luff lining
rigging luff
luffing boom
luffing gear
luffing crane
luffing davit
luffing device or hoist device
luffing gear
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