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公开(公告)号：US1662045A
公开(公告)日：1928-03-06
申请号：US70824024
申请日：1924-04-22
Applicant: GEN ELECTRIC
Inventor： PATTERSON FRANK W
CPC classification number: H01J9/385 , H01J5/24 , H01J2893/0039
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