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公开(公告)号：US2406419A
公开(公告)日：1946-08-27
申请号：US51660043
申请日：1943-12-31
Applicant: CONS ENG CORP
Inventor： WASHBURN HAROLD W , HAROLD WILEY
IPC: H01J9/04
CPC classification number: H01J9/042
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