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公开(公告)号：US1369516A
公开(公告)日：1921-02-22
申请号：US20035417
申请日：1917-11-05
Applicant: MAGNETIC MFG COMPANY
Inventor： BETHKE JOHN P
IPC: B03C1/12
CPC classification number: B03C1/12 , Y10S100/917
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