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公开(公告)号：US2658149A
公开(公告)日：1953-11-03
申请号：US65193946
申请日：1946-03-04
Applicant: GALLAGHER CHARLES J , STANLEY RUTHBERG
Inventor： GALLAGHER CHARLES J , STANLEY RUTHBERG
IPC: H01J17/00
CPC classification number: H01J17/005
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