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公开(公告)号：US2071874A
公开(公告)日：1937-02-23
申请号：US65938233
申请日：1933-03-02
Applicant: PHILIPS NV
Inventor： WILHELM DOBBEN PIETER , JOHANNES VISSER
CPC classification number: H01J5/46 , H01J5/40 , H01J5/42 , H01J2893/0034 , H01J2893/0035
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