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公开(公告)号：US2520190A
公开(公告)日：1950-08-29
申请号：US70585046
申请日：1946-10-24
Applicant: PHILIPS LAB INC
Inventor： AMDURSKY MARK E
IPC: H01J29/89
CPC classification number: H01J29/894 , H01J29/892
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