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公开(公告)号：US1997231A
公开(公告)日：1935-04-09
申请号：US74299434
申请日：1934-09-06
Applicant: PLUTINO NICOLA C
Inventor： PLUTINO NICOLA C
IPC: H01F7/20
CPC classification number: H01F7/206 , Y10S425/033
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