compact support
紧头支柱 Tight-head prop
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新型液压支柱采用密封补偿和密封胀紧等密封方式，可减少因密封泄漏而造成的冒顶等事故隐患，减少密封更换次数及维修次数。
The new type hydraulic prop reduces the accidents due to the seal leaking by using seal-compensation and seal-swelling, and reduces seal change times and maintenance times.
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