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公开(公告)号：US1910755A
公开(公告)日：1933-05-23
申请号：US31335528
申请日：1928-10-18
Applicant: PHILIPS NV
Inventor： DE GROOT WILLEM , WILHELM MULDER JOHANNES GIJSBE
IPC: H01J61/72
CPC classification number: H01J61/72
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