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公开(公告)号：US3168671A
公开(公告)日：1965-02-02
申请号：US8228461
申请日：1961-01-12
Applicant: HAROLD REYNOLDS FREDERICK
Inventor： HAROLD REYNOLDS FREDERICK
CPC classification number: H01J19/38 , H01J19/42 , H01J2893/0005 , H01J2893/0016
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