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公开(公告)号：US2253562A
公开(公告)日：1941-08-26
申请号：US28337739
申请日：1939-07-08
Applicant: FREDERICK POST COMPANY
Inventor： HINMAN WALKER M , HOLIMANN WALTER G
IPC: G03F1/68
CPC classification number: G03F1/68
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