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公开(公告)号：US1666516A
公开(公告)日：1928-04-17
申请号：US33866319
申请日：1919-11-17
Applicant: WILLIAM TSCHUDY
Inventor： WILLIAM TSCHUDY
CPC classification number: H01J13/50 , H01J13/32 , H01J2893/0088 , H05B3/62
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