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    Patent certificate of powder resin covered filter
    Patent certificate of composite flexible furnace top sealing device
    Patent certificate of coal-included waste water processor
    Efficient composite germicide and algicide and preparation method thereof
    Patent certificate of temperature control device of desalted water tank in the thermal power plant
    Patent certificate of water-saving acid mist absorption plant
    Patent certificate of automatic steel ball screening plant for ball mill
    Patent certificate of ball feeder for ball mill
    Patent certificate of big metal container
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