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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
D21F1/48—Suction apparatus
D21F1/50—Suction boxes with rolls
FR508109A1920-01-021920-01-02
Suction box system with active rolling surface and without drawers, for the paper industry and similar products
ExpiredFR508109A
(en)