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公开(公告)号：US1904224A
公开(公告)日：1933-04-18
申请号：US60900932
申请日：1932-05-03
Applicant: HARGROVE CLARENCE A
Inventor： HARGROVE CLARENCE A
IPC: H01F7/20
CPC classification number: H01F7/206 , Y10S425/033
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