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公开(公告)号：US2204252A
公开(公告)日：1940-06-11
申请号：US28346939
申请日：1939-07-08
Applicant: FIDES GMBH
Inventor： OTTO KRENZIEN
CPC classification number: H01J9/125 , H01J1/32 , H01J2201/32 , Y10T428/265
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