Patent classifications
D
TEXTILES; PAPER
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D21
PAPER-MAKING; PRODUCTION OF CELLULOSE
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D21B
FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
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1/00
Fibrous raw materials or their mechanical treatment
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D21B1/02
Pretreatment of the raw materials by chemical or physical means
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D21B1/026
Separating fibrous materials from waste
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