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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11/00
Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
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D21F11/12
Making corrugated paper or board
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