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B01D 2239/04
Additives and treatments of the filtering material
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data.epo.org/linked-data/def/cpc/B01D2239-04
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Patent classification
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Child Classification
B01D 2239/0464
B01D 2239/0435
B01D 2239/0414
B01D 2239/0407
B01D 2239/0471
B01D 2239/0457
B01D 2239/045
B01D 2239/0442
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Cooperative Patent Classification
Parent Classification
B01D 2239/00
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