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  • Closed water ring Roots vacuum unit - Patent
    Closed water ring Roots vacuum unit - Patent
  • Magnetic driven Roots screw vacuum units - Patent
    Magnetic driven Roots screw vacuum units - Patent
  • Double bevel screw rotor - Patented
    Double bevel screw rotor - Patented
  • Case for water cooled Roots vacuum pump - Patent
    Case for water cooled Roots vacuum pump - Patent
  • Automatic collecting roots screw vacuum unit - Patent
    Automatic collecting roots screw vacuum unit - Patent
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