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公开(公告)号：US3550421A
公开(公告)日：1970-12-29
申请号：US3550421D
申请日：1968-10-03
Applicant: FLUTED PAPER PRODUCTS CO INC
Inventor： STAKEL FREDERICK C
CPC classification number: B21D51/2646 , A21B3/132 , B31B50/44 , B31B50/98 , B31B2100/00 , B31B2110/10 , B31B2110/20 , B31B2120/70
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