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公开(公告)号：US2543551A
公开(公告)日：1951-02-27
申请号：US3219448
申请日：1948-06-10
Applicant: STACKPOLE CARBON CO
Inventor： KRUG WILLIAM J
IPC: H01F21/06
CPC classification number: H01F21/06 , Y10T403/4327 , Y10T403/473
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