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公开(公告)号：US1356078A
公开(公告)日：1920-10-19
申请号：US23244918
申请日：1918-05-04
Applicant: DOUGLAS MCGANN WILLIAM
Inventor： DOUGLAS MCGANN WILLIAM
IPC: B42F7/06
CPC classification number: B42F7/06 , B42P2201/08
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