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公开(公告)号：US1917980A
公开(公告)日：1933-07-11
申请号：US43368530
申请日：1930-03-06
Applicant: KELSEY WILLIAM C
Inventor： KELSEY WILLIAM C
IPC: B42F15/00
CPC classification number: B42F15/0094 , B42F15/0035
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