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B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
B31D1/00—Multiple-step processes for making flat articles ; Making flat articles
B31D1/0093—Multiple-step processes for making flat articles ; Making flat articles involving impregnating
FR672645D1928-07-111928-07-11
Improvements made in the manufacture of hard cardboard objects
ExpiredFR672645A
(en)