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公开(公告)号：US2956156A
公开(公告)日：1960-10-11
申请号：US59592856
申请日：1956-07-05
Applicant: PHILIPS CORP
Inventor： OFFLEY CROWTHER GERALD , FREDERICK GIMSON KEITH
IPC: G01R19/165
CPC classification number: G01R19/16514
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