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公开(公告)号：US1417169A
公开(公告)日：1922-05-23
申请号：US43118720
申请日：1920-12-16
Applicant: HEIGH JOHN W
Inventor： HEIGH JOHN W
IPC: B23B31/20
CPC classification number: B23B31/201 , Y10T279/17547
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