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公开(公告)号：US1518506A
公开(公告)日：1924-12-09
申请号：US65500723
申请日：1923-08-01
Applicant: GUNN CHARLES H , NEWCOMB JOHN C
Inventor： GUNN CHARLES H , NEWCOMB JOHN C
IPC: D06F1/08
CPC classification number: D06F1/08
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