| 摘要 |
A boom assembly comprises a primary boom member having one end attachable to a vehicle and a secondary boom member pivotally attached to the free end of the primary boom member for rotation of the secondary boom member about a first axis relative to the primary boom member. The secondary boom member includes a swivel mechanism configured to enable the secondary boom member to rotate relative to the primary boom member about a second axis of rotation independently to rotation of the secondary boom member relative to the primary boom member about the first axis of rotation.
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