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公开(公告)号：US1822679A
公开(公告)日：1931-09-08
申请号：US52372031
申请日：1931-03-19
Applicant: HOWARD D COLMAN
Inventor： STEWART DUNCAN J , LILJA EDGAR D
IPC: H02K17/10
CPC classification number: H02K17/10
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