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公开(公告)号：US2443237A
公开(公告)日：1948-06-15
申请号：US52750044
申请日：1944-03-21
Applicant: PATELHOLD PATENTVERWERTUNG
Inventor： ARTHUR GAUDENZI , OTTO SCHARLI
IPC: H01J21/08
CPC classification number: H01J21/08
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