| 摘要 |
PROBLEM TO BE SOLVED: To reduce a running cost. SOLUTION: The rear end of a paper filter 1 stored in a dust bag 8 has an opening that opens overall, and the rear end is folded several times from the opening, and by blocking the folded portion 1a with a clamper 6, dust can be collected. By removing the clamper 6 after dust is collected, dust is discharged from the opening, thus making a filter reusable.
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