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公开(公告)号：US3525897A
公开(公告)日：1970-08-25
申请号：US3525897D
申请日：1967-10-11
Applicant: GEN ELECTRIC
Inventor： PRE ERNEST T DU
CPC classification number: H01J9/36 , H01J5/46 , H01J19/46 , H01J2893/0007
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