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公开(公告)号：US1767437A
公开(公告)日：1930-06-24
申请号：US14249826
申请日：1926-10-18
Applicant: PHILIPS NV
Inventor： DE BOER JAN HENDRIK , PIETER CLAUSING
IPC: H01J9/395
CPC classification number: H01J9/395
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