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公开(公告)号：US2542440A
公开(公告)日：1951-02-20
申请号：US74122447
申请日：1947-04-14
Applicant: VICTOREEN INSTR COMPANY
Inventor： VICTOREEN JOHN A , BARTON ROGER W
IPC: H01J47/08
CPC classification number: H01J47/08
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