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Patent classifications
D
TEXTILES; PAPER
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D21
PAPER-MAKING; PRODUCTION OF CELLULOSE
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D21F
PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
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13/00
Making discontinuous sheets of paper, pulpboard or cardboard, or of wet web, for fibreboard production
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D21F13/04
on cylinder board machines
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