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公开(公告)号：US2443407A
公开(公告)日：1948-06-15
申请号：US75552947
申请日：1947-06-18
Applicant: WALCS JR NATHANIEL B
Inventor： WALCS JR NATHANIEL B
CPC classification number: H03K29/00 , H01J17/48 , H01J2893/007 , Y10S315/01
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