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D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
D21F1/00—Wet end of machines for making continuous webs of paper
D21F1/32—Washing wire-cloths or felts
FR559441D1921-12-051922-12-05Appareil servant à nettoyer le feutre des machines à fabriquer le carton et le papier pendant leur fonctionnement
ExpiredFR559441A
(fr)