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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
B31C—MAKING WOUND ARTICLES, e.g. WOUND TUBES, OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
B31C7/00—Making conical articles by winding
B31C7/02—Forming truncated cones
B31C7/04—Forming truncated cones on two or more mandrels
FR381472D1907-08-311907-08-31
Improvements to machines for manufacturing light or lost tubes, in paper, for spinning
ExpiredFR381472A
(en)