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公开(公告)号：US3508045A
公开(公告)日：1970-04-21
申请号：US3508045D
申请日：1968-07-12
Applicant: APPLIED RES LAB
Inventor： ANDERSEN CHRISTIAN A , LIEBL HELMUT J
CPC classification number: H01J37/252 , H01J49/10 , H01J49/145
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