PTFE-bellows mechanical seal 聚四氟乙烯波纹管机械密封 formed metal bellows mechanical seal 压力成型金属波纹管机械密封 welded metal bellows mechanical seal 焊接金属波纹管机械密封 ..
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... Meatl bellows mechanical seal|金属波纹管机械密封件 Welded meatal bellows mechanical seal|焊接金属波纹管机械 Formed metal bellows mechanical seal|压力成型金属波纹管机械密封件 ...
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