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公开(公告)号：US2258643A
公开(公告)日：1941-10-14
申请号：US26937039
申请日：1939-04-22
Applicant: PHILIPS NV
Inventor： DE GIER JOHANNES , ANDRIES KRUITHOF ARIE , MICHEL PENNING FRANS
IPC: H01J29/56
CPC classification number: H01J29/56
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