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公开(公告)号：US3050981A
公开(公告)日：1962-08-28
申请号：US3015560
申请日：1960-05-19
Applicant: RCA CORP
Inventor： SCHWARZ HELMUT J
CPC classification number: H01J41/04 , C23C14/544 , G01N27/66 , H01B1/00
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