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公开(公告)号：US2239988A
公开(公告)日：1941-04-29
申请号：US9697636
申请日：1936-08-20
Applicant: JOSEPH B BRENNAN
Inventor： BRENNAN JOSEPH B , LEONA MARSH
IPC: H01G9/12
CPC classification number: H01G9/12
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