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公开(公告)号：US3443149A
公开(公告)日：1969-05-06
申请号：US3443149D
申请日：1967-03-20
Applicant: OHIO BRASS CO
Inventor： HAZEN RAMON B
CPC classification number: H01T4/12 , H01J17/00 , H01J2893/0059 , H01T1/02 , H01T1/04
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