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公开(公告)号：US1777253A
公开(公告)日：1930-09-30
申请号：US17105127
申请日：1927-02-25
Applicant: PHILIPS NV
Inventor： JOHANNES BRUIJNES , DER HOEVEN JACOB VAN , EKKO OOSTERHUIS
IPC: H01J1/14
CPC classification number: H01J1/14
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