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公开(公告)号：US2046111A
公开(公告)日：1936-06-30
申请号：US71397834
申请日：1934-03-05
Applicant: GEN MOTORS CORP
Inventor： ELY EDWARD W , HELGEBY RALPH O
IPC: H01F13/00
CPC classification number: H01F13/003
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