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公开(公告)号：US2711509A
公开(公告)日：1955-06-21
申请号：US43361254
申请日：1954-06-01
Applicant: RCA CORP
Inventor： ENDRES RICHARD O , BLAIR LESTER L
IPC: G01R33/12
CPC classification number: G01R33/1207
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