| 摘要 |
PROBLEM TO BE SOLVED: To provide a pleated filter element filter capable of appropriately plugging surplus filter elements without causing any trouble in the respective fitting parts of the filter elements and easily setting an optimum filtration treatment capacity of the filter. SOLUTION: This filter is provided with plural cylindrical pleated filter elements and plural dummy elements to be plugged, each of which elements is fitted to the filter parallel to the others with substantially the same fitting structure as those of the others.
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