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公开(公告)号：US2251158A
公开(公告)日：1941-07-29
申请号：US28562439
申请日：1939-07-20
Applicant: GEN ELECTRIC
Inventor： OSKAR OGRODOWY
CPC classification number: B65G47/82 , H01J9/46 , H01J2893/0096
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