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公开(公告)号：US2770700A
公开(公告)日：1956-11-13
申请号：US34202653
申请日：1953-03-12
Applicant: STACKPOLE CARBON CO
Inventor： RAGNAR HOLM , HOLM ELSE M K
IPC: H01H1/04
CPC classification number: H01H1/04
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