Cartridge-type one-coil double mechanical seal

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  机译： 插装式一线圈双机械密封

• 4. ONE-COIL DOUBLE MECHANICAL SEAL [P] . 日本专利： JPS6078169A . 1985-05-02

  机译： 一卷双机械密封

• 5. Mechanical seal device, double seal device and double mechanical seal device [P] . 日本专利： JP6581179B2 . 2019-09-25

  机译： 机械密封装置，双密封装置和双机械密封装置

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