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| 折叠式轻便井架; 伸缩式轻便井架 | |||
| 可倒桅 | |||
| 可倒式桅杆 | |||
| 可放倒式桅杆; 可拆卸桅杆 | |||
| 伸缩套管天线杆 | |||
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collapsible mast : 1 phrase in 1 subject |
| Technology | 1 |
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