| 摘要 |
1469740 Electrostatically charged filters VERTO NV 24 March 1975 [25 March 1974] 12176/75 Heading B2J [Also in Division B5] An inherently charged filter for collecting positively- and/or. negatively-charged particles comprises a wound roll of electrostatically charged fibres preferably of polypropylene. The fibres are formed by fibrillating a stretched, charged sheet of polypropylene (see Division B5).
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