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2004-02-08
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Filtering structure for swimming pool
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Improved structure of reverse osmosis filtration core
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Improved structure for reverse osmosis filtering core
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Improved structure of filtration element
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Improved filtering core structure for water filter
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Water-saving reverse osmosis filtration structure of double-looped system
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Improved filtering core structure for reverse osmosis filter
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2003-07-11
Improved filtering core structure for reverse osmosis film
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Magnetic filtration
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Improved structure for water filter
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Porous filtration materials
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Improved structure of filter core
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Improved structure of water purifier/filter
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Improved structure for filtering core
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Wire-winding structure of separate type filter
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2000-12-20
Magnetic filtration
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Water tap with rapid replacement of filtration core set
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2003-01-21
Filter structure